COMPUSA INC
SC TO-T, 2000-02-01
COMPUTER & COMPUTER SOFTWARE STORES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION,
                             WASHINGTON, D.C. 20549
                                  -------------

                                   SCHEDULE TO
                                 (RULE 14d-100)
          TENDER OFFER STATEMENT UNDER SECTION 14 (d) (1) OR 13 (e) (1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. )

                                  CompUSA INC.

                       (Name of Subject Company (Issuer))

                              TPC ACQUISITION CORP.
                                       and
                          GRUPO SANBORNS, S.A. DE C.V.

                      (Names of Filing Persons (Offerors))

                     Common Stock, $.01 Per Share Par Value
           (Including the Associated Rights to Purchase Common Stock)

                         (Title of Class of Securities)

                                    209432107

                      (CUSIP Number of Class of Securities)

                               Rafael Robles Miaja
                     Frank, Galicia, Duclaud y Robles, S.C.
                                  Torre Optima
                                   Tercer Piso
                         Avenida Paseo de las Palmas 405
                          Colonia: Lomas de Chapultepec
                                   D.F. 11000
                                     Mexico
                                011-525-540-9225

                                   Copies to:

                            Daniel S. Sternberg, Esq.
                             Jorge Juantorena, Esq.
                       Cleary, Gottlieb, Steen & Hamilton
                                One Liberty Plaza
                               New York, NY 10006
                                 (212) 225-2000


                 (Name, Address and Telephone Numbers of Person
  Authorized to Receive Notices and Communications on Behalf of Filing Persons)
<PAGE>   2
                            CALCULATION OF FILING FEE
<TABLE>
<S>                                                          <C>
- -----------------------------------------------------------  ---------------------------------------------------------
         Transaction Valuation* $829,478,607.90                         Amount of Filing Fee**165,895.72
- -----------------------------------------------------------  ---------------------------------------------------------
</TABLE>

*    For purposes of calculating the filing fee pursuant to Rule 0-11(d), the
     Transaction Valuation was calculated on the basis of (i) 92,693,889 shares
     of common stock, par value $.01 per share of CompUSA Inc. (the "Common
     Stock"), including the associated Common Stock purchase rights (the
     "Rights" and together with the Common Stock, the "Shares") (13,750,000 of
     which are beneficially owned by the Filing Persons), (ii) the tender offer
     price of $10.10 per Share, and (iii) 13,820,871 options or rights to
     acquire Shares with an aggregate value of $32,145,329.00.

**   The filing fee, calculated in accordance with Rule 0-11 of the Securities
     Exchange Act of 1934, is 1/50th of one percent of the aggregate Transaction
     Valuation.

[ ]  Check the box if any part of the fee is offset as provided by Rule 0-11 (a)
     (2) and identify the filing with which the offsetting fee was previously
     paid. Identify the previous filing by registration statement number, or the
     Form or Schedule and the date of its filing.

        Amount Previously Paid:                   Filing Party:
        Form or Registration No.:                 Date Filed:

[ ]  Check the box if the filing relates solely to preliminary communications
     made before the commencement of a tender offer.

     Check the appropriate boxes below to designate any transactions to which
     the statement relates:

    [X]  third-party tender offer subject to Rule 14d-1.
    [ ]  issuer tender offer subject to Rule 13e-4.
    [ ]  going-private transaction subject to Rule 13e-3.
    [X]  amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of the tender offer: [ ]
<PAGE>   3
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 2 of 15 Pages
- -------------------------------                                                   -------------------------------------


- ------------- -----------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Carlos Slim Helu
- ------------- -----------------------------------------------------------------------------------------------------------

     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- -----------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY

- ------------- -----------------------------------------------------------------------------------------------------------
     4        SOURCE OF FUNDS*
              WC (See Item 3)
- ------------- -----------------------------------------------------------------------------------------------------------

     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          [_]

- ------------- -----------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- ----------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ----------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ----------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


              13,750,000 (See Item 5(a))
- ------------- -----------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

- ------------- -----------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                               [X]

              14.8%
- ------------- -----------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- -----------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   4
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 3 of 15 Pages
- -------------------------------                                                   -------------------------------------


- ------------- -----------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Carlos Slim Domit
- ------------- -----------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- -----------------------------------------------------------------------------------------------------------
     3
              SEC USE ONLY


- ------------- -----------------------------------------------------------------------------------------------------------
     4        SOURCE OF FUNDS*
              WC (See Item 3)

- ------------- -----------------------------------------------------------------------------------------------------------
     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)             [_]

- ------------- -----------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- ----------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ----------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000      (See Items 5(b) and (d))
- ------------- -----------------------------------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              13,750,000 (See Item 5(a))
- ------------- -----------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

- ------------- -----------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                               [X]

              14.8%
- ------------- -----------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- -----------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   5
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 4 of 15 Pages
- -------------------------------                                                   -------------------------------------


- ------------- -------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON


              Marco Antonio Slim Domit
- ------------- -------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- -------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY

- ------------- -------------------------------------------------------------------------------------------------------------
     4        SOURCE OF FUNDS*
              WC (See Item 3)
- ------------- -------------------------------------------------------------------------------------------------------------
     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)             [_]

- ------------- -------------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- ------------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- ------------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ------------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- ------------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000 (See Items 5(b) and (d))
- ------------- -------------------------------------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


              13,750,000 (See Item 5(a))
- ------------- -------------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           [X]


- ------------- -------------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

              14.8%
- ------------- -------------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- -------------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   6
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 5 of 15 Pages
- -------------------------------                                                   -------------------------------------


- ------------- -----------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Patrick Slim Domit
- ------------- -----------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- -----------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY

- ------------ -----------------------------------------------------------------------------------------------------------
     4       SOURCE OF FUNDS*
             WC (See Item 3)

- ------------- -----------------------------------------------------------------------------------------------------------
     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)             [_]

- ------------- -----------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- ----------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ----------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- ----------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000 (See Items 5(b) and (d))
- ------------- -----------------------------------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


              13,750,000 (See Item 5(a))
- ------------- -----------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           [X]

- ------------- -----------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

              14.8%
- ------------- -----------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- -----------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   7
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 6 of 15 Pages
- -------------------------------                                                   -------------------------------------



- ------------- ----------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Maria Soumaya Slim Domit
- ------------- ----------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- ----------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY

- ------------- ----------------------------------------------------------------------------------------------------------
     4        SOURCE OF FUNDS*
              WC (See Item 3)

- ------------- ----------------------------------------------------------------------------------------------------------
     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)             [_]

- ------------- ----------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- ---------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- ---------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- ---------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- ---------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000 (See Items 5(b) and (d))
- ------------- ----------------------------------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


              13,750,000 (See Item 5(a))
- ------------- ----------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           [X]

- ------------- ----------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

              14.8%
- ------------- ----------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- ----------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>   8
<TABLE>
<CAPTION>
<S>                        <C>                                                    <C>
- -------------------------------                                                   -------------------------------------
CUSIP No. 209432107                                                               Page 7 of 15 Pages
- -------------------------------                                                   -------------------------------------


- ------------- ---------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSON
              S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Vanessa Paola Slim Domit
- ------------- ---------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a)[_]
                                                                                                               (b)[_]
- ------------- ---------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY

- ------------- ---------------------------------------------------------------------------------------------------------
     4        SOURCE OF FUNDS*
              WC (See Item 3)

- ------------- ---------------------------------------------------------------------------------------------------------
     5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)             [_]

- ------------- ---------------------------------------------------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Mexico

- -------------------------- ----------- --------------------------------------------------------------------------------
    NUMBER OF SHARES           7       SOLE VOTING POWER

- -------------------------- ----------- --------------------------------------------------------------------------------
  BENEFICIALLY OWNED BY        8       SHARED VOTING POWER
                                       13,750,000 (See Items 5(b) and (d))
- -------------------------- ----------- --------------------------------------------------------------------------------
  EACH REPORTING PERSON        9       SOLE DISPOSITIVE POWER

- -------------------------- ----------- --------------------------------------------------------------------------------
          WITH                 10      SHARED DISPOSITIVE POWER
                                       13,750,000 (See Items 5(b) and (d))
- ------------- ---------------------------------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


              13,750,000 (See Item 5(a))
- ------------- ---------------------------------------------------------------------------------------------------------
     12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                              [X]

- ------------- ---------------------------------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

              14.8%
- ------------- ---------------------------------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON*

              IN
- ------------- ---------------------------------------------------------------------------------------------------------
</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   9
- -------------------                                           ------------------
CUSIP No. 209432107                                           Page 8 of 15 Pages
- -------------------                                           ------------------

- --------------------------------------------------------------------------------
     1         NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               Johanna Monique Slim Domit
- --------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [_]
                                                                         (b) [_]
- --------------------------------------------------------------------------------
     3         SEC USE ONLY

- --------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

               WC (See Item 3)
- --------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
               TO ITEMS 2(d) or 2(e)                                         [_]

- --------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

               Mexico

- --------------------------------------------------------------------------------
     NUMBER OF      7       SOLE VOTING POWER

      SHARES
- --------------------------------------------------------------------------------
   BENEFICIALLY     8       SHARED VOTING POWER

     OWNED BY               13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
  EACH REPORTING    9       SOLE DISPOSITIVE POWER

      PERSON
- --------------------------------------------------------------------------------
       WITH        10       SHARED DISPOSITIVE POWER

                            13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
     11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               13,750,000 (See Item 5(a))
- --------------------------------------------------------------------------------
     12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       [X]

- --------------------------------------------------------------------------------
     13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

               14.8%
- --------------------------------------------------------------------------------
     14        TYPE OF REPORTING PERSON*

               IN
- --------------------------------------------------------------------------------




                     * SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   10
- -------------------                                           ------------------
CUSIP No. 209432107                                           Page 9 of 15 Pages
- -------------------                                           ------------------

- --------------------------------------------------------------------------------
     1         NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               Grupo Carso, S.A. de C.V.
- --------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [_]
                                                                         (b) [_]
- --------------------------------------------------------------------------------
     3         SEC USE ONLY

- --------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*

               WC (See Item 3)
- --------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
               TO ITEMS 2(d) or 2(e)                                         [_]

- --------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

               Mexico

- --------------------------------------------------------------------------------
     NUMBER OF      7       SOLE VOTING POWER

      SHARES
- --------------------------------------------------------------------------------
   BENEFICIALLY     8       SHARED VOTING POWER

     OWNED BY               13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
  EACH REPORTING    9       SOLE DISPOSITIVE POWER

      PERSON
- --------------------------------------------------------------------------------
       WITH        10       SHARED DISPOSITIVE POWER

                            13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
     11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               13,750,000 (See Item 5(a))
- --------------------------------------------------------------------------------
     12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       [X]

- --------------------------------------------------------------------------------
     13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

               14.8%
- --------------------------------------------------------------------------------
     14        TYPE OF REPORTING PERSON*

               CO, HC
- --------------------------------------------------------------------------------




                     * SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   11
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 10 of 15 Pages
- -------------------                                          -------------------

- --------------------------------------------------------------------------------
     1         NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               Grupo Sanborns, S.A. de C.V.
- --------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [_]
                                                                         (b) [_]
- --------------------------------------------------------------------------------
     3         SEC USE ONLY

- --------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*
               WC
- --------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
               TO ITEMS 2(d) or 2(e)                                         [_]

- --------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

               Mexico
- --------------------------------------------------------------------------------
     NUMBER OF      7       SOLE VOTING POWER

      SHARES
- --------------------------------------------------------------------------------
   BENEFICIALLY     8       SHARED VOTING POWER

     OWNED BY               13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
  EACH REPORTING    9       SOLE DISPOSITIVE POWER

      PERSON
- --------------------------------------------------------------------------------
       WITH        10       SHARED DISPOSITIVE POWER

                            13,750,000 (See Items 5(b) and (d))
- --------------------------------------------------------------------------------
     11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               13,750,000 (See Item 5(a))
- --------------------------------------------------------------------------------
     12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       [X]
- --------------------------------------------------------------------------------
     13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

               14.8%
- --------------------------------------------------------------------------------
     14        TYPE OF REPORTING PERSON*

               CO,HC
- --------------------------------------------------------------------------------




                     * SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>   12
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 11 of 15 Pages
- -------------------                                          -------------------

                  This Tender Offer Statement on Schedule TO (this "Schedule
TO") relates to the offer by TPC Acquisition Corp. ("Purchaser"), a Delaware
corporation and a wholly-owned subsidiary of Grupo Sanborns, S.A. de C.V., a
corporation organized under the laws of the United Mexican States ("Parent"), to
purchase all the outstanding shares of common stock, par value $.01 per share
(the "Common Stock"), of CompUSA Inc,. a Delaware corporation (the "Company")
including the associated Common Stock purchase rights (the "Rights" and,
together with the Common Stock, the "Shares"), which are not owned by Parent or
its affiliates, at a purchase price of $10.10 per Share, net to the seller in
cash, without interest thereon, upon the terms and subject to the conditions set
forth in the Offer to Purchase dated February 1, 2000 (the "Offer to Purchase")
and in the related Letter of Transmittal (which, together with any amendments or
supplements thereto, collectively constitute the "Offer") which are annexed to
and filed with this Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B),
respectively. This Schedule TO is being filed on behalf of Purchaser and Parent.

                  Although not a Filing Person, information regarding Telefonos
de Mexico, S.A. de C.V. ("Telmex") has been included in this Schedule TO that
would be required to be included if Telmex were a "bidder" in connection with
the Offer for purposes of applicable rules under the Securities Exchange Act of
1934. However, Parent, Purchaser and Telmex disclaim that Telmex is a "bidder"
and the inclusion of such information should not be taken as an admission to
that effect.

                  All information set forth in the Offer to Purchase filed as
Exhibit (a)(1)(A) to this Schedule TO is incorporated by reference in answer to
items 1 through 11 in this Schedule TO, except those items as to which
information is specifically provided herein.

                  This Tender Offer Statement also amends the Schedule 13D, as
previously amended, of the Slim family (as defined therein); Grupo Carso, S.A.
de C.V. and Parent filed with the Securities and Exchange Commission on November
22, 1999 (the "Schedule 13D"), which is incorporated herein by reference.

ITEM 3.  IDENTITY AND BACKGROUND OF FILING PERSON.

                  Reference is hereby made to the information insert regarding
the directors and executive officers of Telmex set forth in Exhibit (j) hereto,
which is incorporated herein by reference.

ITEM 5.  PAST CONTACTS, TRANSACTIONS, NEGOTIATIONS AND AGREEMENTS.

                  (a) - (b) & (e) With respect to Telmex, none.



ITEM 8.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

                  With respect to Telmex, none.
<PAGE>   13
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 12 of 15 Pages
- -------------------                                          -------------------

ITEM 10. FINANCIAL STATEMENTS.

                  Not applicable.

ITEM 11. ADDITIONAL INFORMATION.

                  (b) Reference is hereby made to the Form of Letter of
Transmittal, the Form of Notice of Guaranteed Delivery, the Amendments to
Employment Agreements, each dated as of January 23, 2000, between the Company
and certain of its executive officers and the letter dated January 23, 2000 from
Telmex to Parent, copies of which are attached hereto as exhibits (a)(1)(B),
(a)(1)(C), (d)(1) and (i), respectively; to the Merger Agreement, dated as of
January 23, 2000, among Parent, Purchaser and the Company which has previously
been filed as an exhibit to the Schedule 13D; and to the Schedule 13D, all of
which are incorporated herein by reference.

ITEM 12. EXHIBITS.

                  (a)(1)(A)     Offer to Purchase, dated as of February 1, 2000

                  (a)(1)(B)     Form of Letter of Transmittal

                  (a)(1)(C)     Form of Notice of Guaranteed Delivery

                  (a)(1)(D)     Form of Letter to Brokers, Dealers, Commercial
                                Banks, Trust Companies and Other Nominees

                  (a)(1)(E)     Form of Letter to Clients for Use by Brokers,
                                Dealers, Commercial Banks, Trust Companies and
                                Other Nominees

                  (a)(1)(F)     Guidelines for Certification of taxpayer
                                Identification Number on Substitute Form W-9

                  (a)(1)(G)     Text of press release issued by Parent and the
                                Company on February 1, 2000

                  (a)(1)(H)     Summary Advertisement, published February 1,
                                2000

                  (b)           Not applicable.

                  (d)(1)        Amendments to Employment Agreements, each dated
                                as of January 23, 2000, between the Company and
                                certain of its executive officers

                  (g)           Not applicable.

                  (h)           Not applicable.
<PAGE>   14
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 13 of 15 Pages
- -------------------                                          -------------------

                  (i)           Letter from Telefonos de Mexico, S.A. de C.V. to
                                Grupo Sanborns, S.A. de C.V., dated as of
                                January 23, 2000

                  (j)           Information Concerning the Members of the Board
                                of Directors and the Executive Officers of
                                Telefonos de Mexico, S.A. de C.V.

                  (k)           Power of Attorney
<PAGE>   15
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 14 of 15 Pages
- -------------------                                          -------------------


                                    SIGNATURE

                  After due inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.

Dated: February 1, 2000


                                             GRUPO SANBORNS, S.A. DE C.V.


                                             By:  /s/ Eduardo Valdes
                                                 -------------------------------

                                               Name:  Eduardo Valdes

                                               Title: Attorney-in-Fact


                                             TPC ACQUISITION CORP.


                                             By:     Javier Cervantes
                                                 -------------------------------

                                               Name: Javier Cervantes

                                               Title: Director and Secretary
<PAGE>   16
- -------------------                                          -------------------
CUSIP No. 209432107                                          Page 15 of 15 Pages
- -------------------                                          -------------------


                                INDEX TO EXHIBITS


Exhibit Number         Description


(a)(1)(A)              Offer to Purchase, dated as of February 1, 2000

(a)(1)(B)              Form of Letter of Transmittal

(a)(1)(C)              Form of Notice of Guaranteed Delivery

(a)(1)(D)              Form of Letter to Brokers, Dealers, Commercial Banks,
                       Trust Companies and Other Nominees

(a)(1)(E)              Form of Letter to Clients for Use by Brokers, Dealers,
                       Commercial Banks, Trust Companies and Other Nominees

(a)(1)(F)              Guidelines for Certification of taxpayer Identification
                       Number on Substitute Form W-9

(a)(1)(G)              Text of press release issued by Parent and the Company on
                       February 1, 2000

(a)(1)(H)              Summary Advertisement, published February 1, 2000

(d)(1)                 Amendments to Employment Agreements, each dated as of
                       January 23, 2000, between the Company and certain of its
                       executive officers

(i)                    Letter from Telefonos de Mexico, S.A. de C.V. to Grupo
                       Sanborns, S.A. de C.V., dated as of January 23, 2000

(j)                    Information Concerning the Members of the Board of
                       Directors and the Executive Officers of Telefonos de
                       Mexico, S.A. de C.V.

(k)                    Power of Attorney

<PAGE>   1

                           OFFER TO PURCHASE FOR CASH

                 ALL OF THE OUTSTANDING SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)
                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY-OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
       TIME, ON TUESDAY, FEBRUARY 29, 2000, UNLESS THE OFFER IS EXTENDED.

     THIS OFFER IS BEING MADE IN CONNECTION WITH THE MERGER AGREEMENT, DATED AS
OF JANUARY 23, 2000 (THE "MERGER AGREEMENT"), AMONG GRUPO SANBORNS, S.A. DE C.V.
("PARENT"), TPC ACQUISITION CORP. ("PURCHASER") AND COMPUSA INC. (THE
"COMPANY"). THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE
MERGER AGREEMENT, THE OFFER AND THE MERGER (EACH AS DEFINED HEREIN), DETERMINED
THAT THE OFFER AND THE MERGER ARE ADVISABLE AND FAIR TO, AND IN THE BEST
INTERESTS OF, THE HOLDERS OF SHARES (AS DEFINED HEREIN) (OTHER THAN PARENT AND
ITS AFFILIATES) AND UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS ACCEPT THE OFFER
AND TENDER THEIR SHARES PURSUANT TO THE OFFER.

     THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, THERE BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION OF THE OFFER THAT NUMBER OF
SHARES WHICH, TOGETHER WITH ANY SHARES THEN BENEFICIALLY OWNED BY PARENT OR
PURCHASER OR ANY OF THEIR RESPECTIVE AFFILIATES, REPRESENTS AT LEAST TWO-THIRDS
OF THE ISSUED AND OUTSTANDING SHARES ON A FULLY DILUTED BASIS.
                            ------------------------

                                   IMPORTANT

     Shareholders desiring to tender all or any portion of their shares of
common stock, par value $.01 per share (the "COMMON STOCK"), of the Company,
including the associated common stock purchase rights (the "RIGHTS" and,
together with the Common Stock, the "SHARES") should either: (1) complete and
sign the Letter of Transmittal or a facsimile thereof in accordance with the
instructions in the Letter of Transmittal, including any required signature
guarantees, and mail or deliver the Letter of Transmittal or such facsimile with
certificate(s) for the tendered Shares and any other required documents to the
Depositary (as defined herein), or (2) follow the procedures for book-entry
tender of Shares set forth in Section 3 or (3) request such shareholder's
broker, dealer, commercial bank, trust company or other nominee to effect the
transaction for such shareholder. Shareholders whose Shares are registered in
the name of a broker, dealer, commercial bank, trust company or other nominee
must contact such broker, dealer, commercial bank, trust company or other
nominee if they desire to tender such Shares.

     The Rights are presently evidenced by the certificates for the Common Stock
and a tender by shareholders of their shares of Common Stock will also
constitute a tender of the associated Rights. A shareholder who desires to
tender Shares and whose certificates for such Shares are not immediately
available, or who cannot comply with the procedure for book-entry transfer on a
timely basis, may tender such Shares by following the procedures for guaranteed
delivery set forth in Section 3.

     Questions and requests for assistance may be directed to the Information
Agent (as defined herein) at its address and telephone number set forth on the
back cover of this Offer to Purchase. Requests for additional copies of this
Offer to Purchase and the Letter of Transmittal may be directed to the
Information Agent or to brokers, dealers, commercial banks or trust companies.

                    THE INFORMATION AGENT FOR THE OFFER IS:

                          [MACKENZIE PARTNERS, INC.]

February 1, 2000
<PAGE>   2

<TABLE>
<C>   <S>                                                             <C>
SUMMARY TERM SHEET................................................      1
INTRODUCTION......................................................      4
THE TENDER OFFER..................................................      6
 1.   Terms of the Offer..........................................      6
 2.   Acceptance for Payment and Payment for Shares...............      8
 3.   Procedure for Tendering Shares..............................      9
 4.   Withdrawal Rights...........................................     11
 5.   Certain United States Federal Income Tax Consequences of the
      Offer.......................................................     12
 6.   Price Range of Shares; Dividends............................     13
 7.   Possible Effects of the Offer on the Market for the Shares;
      NYSE Listing; Margin Regulations and Exchange Act
      Registration................................................     13
 8.   Certain Information Concerning the Company..................     14
 9.   Certain Information Concerning Purchaser and Parent.........     17
10.   Background of the Offer; Contacts with the Company..........     18
11.   Purpose of the Offer; Plans for the Company; the Merger
      Agreement and Executive Employment Agreements...............     20
12.   Rights Agreement............................................     28
13.   Source and Amount of Funds..................................     30
14.   Certain Conditions of the Offer.............................     31
15.   Certain Legal Matters.......................................     32
16.   Fees and Expenses...........................................     34
17.   Miscellaneous...............................................     35
SCHEDULE A -- Information Concerning Members of the Board of
              Directors and the Executive Officers of Parent and
              Purchaser and Persons Ultimately Controlling Parent
              and Purchaser.......................................     36
</TABLE>

                                        i
<PAGE>   3

                               SUMMARY TERM SHEET

     TPC Acquisition Corp., which is referred to in this offer to purchase as
"PURCHASER", is offering to purchase all of the outstanding shares of common
stock of CompUSA Inc., which is referred to in this offer to purchase as the
"COMPANY", for $10.10 per share in cash. The following are some of the questions
you, as a shareholder of CompUSA Inc., may have and answers to those questions.
We urge you to read the remainder of this offer to purchase and the letter of
transmittal carefully because the information in this summary is not complete
and additional important information is contained in the remainder of this offer
to purchase and the letter of transmittal.

WHO IS OFFERING TO BUY MY SHARES?

     TPC Acquisition Corp. is a Delaware corporation formed for the purpose of
making this tender offer. TPC Acquisition Corp. is a wholly-owned subsidiary of
Grupo Sanborns, S.A. de C.V, a corporation organized under the laws of the
United Mexican States, which is referred to in this offer to purchase as
"PARENT". See Section 9 of this offer to purchase -- "CERTAIN INFORMATION
CONCERNING PURCHASER AND PARENT."

WHAT SHARES ARE BEING SOUGHT IN THE OFFER?

     TPC Acquisition Corp. is offering to purchase all of the outstanding shares
of common stock of CompUSA which Grupo Sanborns and its affiliates do not
already own. Grupo Sanborns and its affiliates now own 13,750,000 shares, or
about 14.8% of the outstanding shares. See "INTRODUCTION" and Section 1 of this
offer to purchase -- "TERMS OF THE OFFER."

HOW MUCH ARE YOU OFFERING TO PAY AND WHAT IS THE FORM OF PAYMENT?

     TPC Acquisition Corp. is offering to pay $10.10 per share, net to you, in
cash. See "INTRODUCTION" and Section 1 of the offer to purchase -- "TERMS OF THE
OFFER."

DO YOU HAVE THE FINANCIAL RESOURCES TO MAKE PAYMENT?

     Grupo Sanborns, the parent of TPC Acquisition Corp., and one or more other
investors will provide TPC Acquisition Corp. with sufficient funds from their
own resources to acquire all tendered shares or shares to be acquired in the
merger which is expected to follow the successful completion of the offer. The
offer is not conditioned upon any financing arrangements. See Section 13 of this
offer to purchase -- "SOURCE AND AMOUNT OF FUNDS."

IS YOUR FINANCIAL CONDITION RELEVANT TO MY DECISION TO TENDER IN THE OFFER?

     We do not think our financial condition is relevant to your decision
whether to tender shares and accept the offer because:

     - the offer is being made for all outstanding shares solely for cash,

     - the offer is not subject to any financing condition, and

     - if we consummate the offer, we will acquire all remaining shares for the
       same cash price in the merger.

HOW LONG DO I HAVE TO DECIDE WHETHER TO TENDER IN THE OFFER?

     You will have at least until 12:00 midnight, New York City time, on
February 29, 2000, to decide whether to tender your shares in the offer. See
Sections 1 and 3 of this offer to purchase -- "TERMS OF THE OFFER"
and -- "PROCEDURE FOR TENDERING SHARES -- Notice of Guaranteed Delivery."

CAN THE OFFER BE EXTENDED AND UNDER WHAT CIRCUMSTANCES?

     Yes. We have agreed with CompUSA that we may extend the offer if at the
time the offer is scheduled to expire (including at the end of an earlier
extension) any of the offer conditions is not satisfied (or waived by

                                        1
<PAGE>   4

us) or if we are required to extend the offer by the rules of the Securities and
Exchange Commission. See Section 1 of this offer to purchase -- "TERMS OF THE
OFFER."

     We may also elect to provide a "subsequent offering period" for the offer.
A subsequent offering period, if one is included, will be an additional period
of time beginning after we have purchased shares tendered during the offer,
during which shareholders may tender their shares and receive the offer
consideration. If we decide to provide a "subsequent offering period" we will
make a public announcement of our decision at least five business days in
advance. See Section 1 of this offer to purchase -- "TERMS OF THE OFFER."

HOW WILL I BE NOTIFIED IF THE OFFER IS EXTENDED?

     If we extend the offer, we will inform Citibank, N.A. (which is the
depositary for the offer) of that fact and will make a public announcement of
the extension, by not later than 9:00 a.m., New York City time, on the day after
the day on which the offer was scheduled to expire.

WHAT ARE THE MOST SIGNIFICANT CONDITIONS TO THE OFFER?

     We are not obligated to purchase any tendered shares unless the number of
tendered shares, when added to the shares then owned by Grupo Sanborns and its
affiliates, equals at least two-thirds of the shares of CompUSA outstanding on a
fully diluted basis. We are also not obligated to purchase tendered shares if
there is a material adverse change in CompUSA or its business. The offer is also
subject to a number of other conditions. See Section 14 of this offer to
purchase -- "CERTAIN CONDITIONS OF THE OFFER."

HOW DO I TENDER MY SHARES?

     To tender shares, you must deliver the certificates representing your
shares, together with a completed letter of transmittal and any other documents
required, to Citibank, N.A., the depositary for the offer, not later than the
time the tender offer expires. If your shares are held in street name, the
shares can only be tendered by your nominee through The Depository Trust
Company. If you cannot deliver something that is required to the depositary by
the expiration of the tender offer, you may get a little extra time to do so by
having a broker, a bank or other fiduciary, which is a member of the Securities
Transfer Agents Medallion Program or other eligible institution, guarantee that
the missing items will be received by the depositary within three New York Stock
Exchange trading days. However, the depositary must receive the missing items
within that three trading day period. See Section 3 of this offer to
purchase -- "PROCEDURE FOR TENDERING SHARES."

UNTIL WHAT TIME CAN I WITHDRAW PREVIOUSLY TENDERED SHARES?

     You can withdraw shares at any time until the offer has expired and, if we
have not by February 29, 2000 agreed to accept your shares for payment, you can
withdraw them at any time after such time until we accept shares for payment. If
we decide to provide a subsequent offering period, we will accept shares
tendered during that period immediately and thus you will not be able to
withdraw shares tendered in the offer during any subsequent offering period. See
Sections 1 and 4 of this offer to purchase -- "TERMS OF THE OFFER" and
"WITHDRAWAL RIGHTS."

HOW DO I WITHDRAW PREVIOUSLY TENDERED SHARES?

     To withdraw shares, you must deliver a written notice of withdrawal, or a
facsimile of one, with the required information to the depositary while you
still have the right to withdraw the shares. See Sections 1 and 4 of this offer
to purchase -- "TERMS OF THE OFFER" and "WITHDRAWAL RIGHTS."

WHAT DOES THE COMPUSA BOARD OF DIRECTORS THINK OF THE OFFER?

     TPC Acquisition Corp. is making the offer pursuant to a merger agreement
with CompUSA. The CompUSA Board of Directors unanimously approved the merger
agreement, TPC Acquisition Corp.'s tender offer and its proposed merger with
CompUSA. The CompUSA Board has determined that the offer and the merger are
advisable, fair to, and in the best interests of, CompUSA's shareholders (other
than Grupo

                                        2
<PAGE>   5

Sanborns and its affiliates) and it unanimously recommends that shareholders
accept the offer and tender their shares. See Section 10 of this offer to
purchase -- "BACKGROUND OF THE OFFER; CONTACTS WITH THE COMPANY." CompUSA has
prepared a Solicitation and Recommendation Statement containing additional
information regarding the Board's determination and recommendation, which is
being sent to shareholders together with this offer to purchase.

WILL THE TENDER OFFER BE FOLLOWED BY A MERGER IF ALL THE SHARES ARE NOT TENDERED
IN THE OFFER?

     If TPC Acquisition Corp. purchases in the offer at least the number of
shares which, when added to the shares then owned by Grupo Sanborns and its
affiliates, equals at least two-thirds of the shares of CompUSA outstanding on a
fully diluted basis, TPC Acquisition Corp. will be merged with CompUSA. If that
merger takes place, Grupo Sanborns and its affiliates will own all of the shares
of CompUSA and all other shareholders of CompUSA will receive the same price
paid in the offer, that is, $10.10 per share in cash (or any other higher price
per share which is paid in the offer). See "INTRODUCTION" and Section 11 of this
offer to purchase -- "PURPOSE OF THE OFFER; PLANS FOR THE COMPANY; THE MERGER
AGREEMENT AND EXECUTIVE EMPLOYMENT AGREEMENTS -- The Merger Agreement." There
are no appraisal rights available in connection with the offer. However, if the
merger takes place, shareholders who have not sold their shares in the offer
will have appraisal rights under Delaware law. See Section 15 of this offer to
purchase -- "CERTAIN LEGAL MATTERS -- Appraisal Rights".

IF I DECIDE NOT TO TENDER, HOW WILL THE OFFER AFFECT MY SHARES?

     If the merger takes place, shareholders who do not tender in the offer will
receive in the merger the same amount of cash per share which they would have
received had they tendered their shares in the offer. Therefore, if the merger
takes place, the only difference to you between tendering shares and not
tendering shares is that you will be paid earlier if you tender your shares.
However, until the merger is consummated or if the merger were not to take place
for some reason, the number of shareholders of CompUSA and the shares of CompUSA
which are still in the hands of the public may be so small that there no longer
will be an active public trading market (or, possibly, any public trading
market) for the shares. Also, the shares may no longer be eligible to be traded
on The New York Stock Exchange or any other securities exchange, and CompUSA may
cease making filings with the Commission or otherwise cease being required to
comply with the Commission's rules relating to publicly held companies. See
Sections 7 and 11 of the offer to purchase -- "POSSIBLE EFFECTS OF THE OFFER ON
MARKET FOR THE SHARES; NYSE LISTING; MARGIN REGULATION AND EXCHANGE ACT
REGISTRATION" and "PURPOSE OF THE OFFER; PLANS FOR THE COMPANY; THE MERGER
AGREEMENT AND EXECUTIVE EMPLOYMENT AGREEMENTS -- The Merger Agreement." of this
offer to purchase.

WHAT IS THE MARKET VALUE OF MY SHARES AS OF A RECENT DATE?

     On January 21, 2000, the last trading day before Grupo Sanborns and CompUSA
announced that they had signed the Merger Agreement, the last sale price of the
shares reported on The New York Stock Exchange was $6.75 per share. On January
31, 2000, the last trading day before TPC Acquisition Corp. commenced its tender
offer, the last sale price of the shares was $9 5/8 per share. We advise you to
obtain a recent quotation for shares of CompUSA in deciding whether to tender
your shares. See Section 6 of this offer to purchase  -- "PRICE RANGE FOR THE
SHARES; DIVIDENDS."

WHO CAN I TALK TO IF I HAVE QUESTIONS ABOUT THE TENDER OFFER?

     You can call MacKenzie Partners ((800) 322-2885 (toll free)). MacKenzie
Partners is acting as the information agent for our tender offer. See the cover
page of this offer to purchase.

                                        3
<PAGE>   6

TO THE HOLDERS OF SHARES OF COMMON STOCK
OF COMPUSA INC.:

                                  INTRODUCTION

     TPC Acquisition Corp., a Delaware corporation ("PURCHASER") and a
wholly-owned subsidiary of Grupo Sanborns, S.A. de C.V., a corporation organized
under the laws of the United Mexican States ("PARENT"), hereby offers to
purchase all of the outstanding shares of common stock, par value $.01 per share
(the "COMMON STOCK"), of CompUSA Inc., a Delaware corporation (the "COMPANY"),
including the associated Common Stock purchase rights (the "RIGHTS"), issued
pursuant to the Rights Agreement (the "RIGHTS AGREEMENT"), dated as of April 29,
1994, as amended as of January 23, 2000, between the Company and American Stock
Transfer & Trust Company (formerly Bank One, Texas, N.A.), as Rights Agent (the
Common Stock and the Rights together are referred to herein as the "SHARES"),
which are not owned by Parent or its affiliates, at $10.10 per Share, net to the
seller in cash (the "SHARE PRICE"), without interest thereon upon the terms and
subject to the conditions set forth in this Offer to Purchase and in the related
Letter of Transmittal (which, together with any amendments or supplements
thereto, collectively constitute the "OFFER"). Unless the context otherwise
requires, all references to Shares shall include the associated Rights.

     Tendering shareholders will not be obligated to pay brokerage fees or
commissions or, subject to Instruction 6 of the Letter of Transmittal, transfer
taxes on the purchase of Shares by Purchaser. Purchaser will pay all charges and
expenses of Citibank, N.A. (the "DEPOSITARY") and MacKenzie Partners, Inc. (the
"INFORMATION AGENT").

     THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, THERE HAVING BEEN
VALIDLY TENDERED AND NOT PROPERLY WITHDRAWN PRIOR TO THE EXPIRATION DATE (AS
DEFINED IN SECTION 1) THAT NUMBER OF SHARES WHICH, TOGETHER WITH ANY SHARES THEN
BENEFICIALLY OWNED BY PURCHASER OR PARENT OR ANY OF THEIR RESPECTIVE AFFILIATES,
REPRESENTS AT LEAST TWO-THIRDS OF THE TOTAL NUMBER OF OUTSTANDING SHARES ON A
FULLY DILUTED BASIS (THE "MINIMUM TENDER CONDITION"). THE OFFER IS ALSO SUBJECT
TO CERTAIN OTHER TERMS AND CONDITIONS.

     THE OFFER WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON TUESDAY,
FEBRUARY 29, 2000 UNLESS EXTENDED. SEE SECTIONS 1, 14 AND 15.

     The Offer is being made pursuant to a Merger Agreement (the "MERGER
AGREEMENT"), dated as of January 23, 2000, among the Company, Parent and
Purchaser, pursuant to which, after the completion of the Offer and the
satisfaction or waiver of certain conditions, Purchaser will be merged with and
into the Company and the Company will be the surviving corporation (the
"MERGER"). The Merger Agreement is an exhibit to Amendment No. 1 to the Schedule
13D of the Slim Family (as defined herein), Grupo Carso, S.A. de C.V. ("CARSO")
and Parent filed with the Securities and Exchange Commission (the "COMMISSION")
on November 22, 1999. On the effective date of the Merger, each outstanding
Share (other than Shares owned by Parent, Purchaser or any subsidiary or
affiliate of Parent, Purchaser or the Company or held in the treasury of the
Company or held by shareholders who properly exercise dissenters' rights, if
any), will by virtue of the Merger, and without action by the holder thereof, be
canceled and converted into the right to receive an amount in cash, without
interest, equal to the per Share price paid pursuant to the Offer (the "MERGER
CONSIDERATION") upon the surrender of the certificate formerly representing such
Share. The Merger Agreement is more fully described in Section 11 below. Certain
United States federal income tax consequences of the sale of Shares pursuant to
the Offer and the Merger, as the case may be, are described in Section 5 below.

     THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE MERGER
AGREEMENT, THE OFFER AND THE MERGER, DETERMINED THAT THE OFFER AND THE MERGER
ARE ADVISABLE AND FAIR TO, AND IN THE BEST INTERESTS OF, THE HOLDERS OF SHARES
(OTHER THAN PARENT AND ITS AFFILIATES) AND UNANIMOUSLY RECOMMENDS THAT
SHAREHOLDERS ACCEPT THE OFFER AND TENDER THEIR SHARES PURSUANT TO THE OFFER.

     Credit Suisse First Boston Corporation ("CREDIT SUISSE FIRST BOSTON"), the
Company's financial advisor, has delivered to the Board of Directors of the
Company a written opinion, dated January 23, 2000, to the effect

                                        4
<PAGE>   7

that, as of that date and based on and subject to the matters described in the
opinion, the $10.10 per Share cash consideration to be received in the Offer and
the Merger, taken together, by the holders of Shares was fair, from a financial
point of view, to such holders (other than Parent and its affiliates). A copy of
Credit Suisse First Boston's written opinion, which sets forth the assumptions
made, procedures followed, matters considered and limitations on the review
undertaken, is contained in the Company's Solicitation/Recommendation Statement
on Schedule 14D-9 (the "SCHEDULE 14D-9") filed with the Commission in connection
with the Offer, a copy of which (without certain exhibits) is being furnished to
shareholders concurrently herewith.

     If the Minimum Tender Condition and the other conditions to the Offer are
satisfied and the Offer is consummated, Purchaser will own a sufficient number
of Shares to ensure that the Merger will be approved. Under the Delaware General
Corporation Law (the "DGCL") if, after consummation of the Offer, Purchaser owns
at least 90 percent of the Shares then outstanding, Purchaser will be able to
cause the Merger to occur without a vote of the Company's shareholders. If,
however, after consummation of the Offer Purchaser owns less than 90 percent of
the then-outstanding Shares, a vote of the Company's shareholders will be
required under the DGCL to approve the Merger. See Section 11.

     The Offer is conditioned upon, among other things, the Minimum Tender
Condition being satisfied, which is more fully described in Section 14 below.
The Company has informed Purchaser that, as of January 20, 2000, there were
92,693,889 Shares issued and outstanding and there were 13,820,871 Shares
subject to issuance pursuant to the Company's stock option and incentive plans.
As of the date of this Offer to Purchase, Parent beneficially owns 13,750,000
Shares, which represent approximately 14.8 percent of the Shares issued and
outstanding as of such date, and no rights to acquire Shares. See Section 11.

     Based on the foregoing, and assuming no additional Shares (or warrants,
options or rights exercisable for, or securities convertible into, Shares) have
been issued (other than Shares issued pursuant to the stock option and incentive
plans referred to above) as of January 20, 2000, Purchaser believes there are
approximately 106,514,760 Shares outstanding on a fully diluted basis.
Accordingly, Purchaser believes it beneficially owns 12.9 percent of the Shares
on a fully diluted basis and that the Minimum Tender Condition would be
satisfied if at least approximately 57,260,195 Shares are validly tendered prior
to the Expiration Date (as defined in Section 1) and not properly withdrawn.

     No appraisal rights are available in connection with the Offer; however,
shareholders may have appraisal rights in connection with the Merger. See
Section 11.

     THIS OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION THAT SHOULD BE READ CAREFULLY AND IN THEIR ENTIRETY BEFORE
ANY DECISION IS MADE WITH RESPECT TO THE OFFER.

                                        5
<PAGE>   8

                                THE TENDER OFFER

1. TERMS OF THE OFFER

     Upon the terms and subject to the conditions of the Offer (including, if
the Offer is extended or amended, the terms and conditions of any extension or
amendment), Purchaser will accept for payment and pay for all Shares validly
tendered prior to the Expiration Date and not theretofore properly withdrawn in
accordance with Section 4. The term "EXPIRATION DATE" means 12:00 Midnight, New
York City time, on Tuesday, February 29, 2000, unless Purchaser shall have
extended the initial period of time during which the Offer is open, in which
event the term "EXPIRATION DATE" shall mean the latest time and date at which
the Offer, as so extended by Purchaser, shall expire. If Purchaser shall decide,
in its sole discretion, to increase the consideration offered in the Offer to
holders of Shares and if, at the time that notice of such change is first
published, sent or given to holders of Shares in the manner specified below, the
Offer is scheduled to expire at any time earlier than the expiration of a period
ending on the tenth business day from, and including, the date that such notice
is first so published, sent or given, then the Offer will be extended until the
expiration of such period of 10 business days. For purposes of the Offer, a
"BUSINESS DAY" means any day other than a Saturday, Sunday or a federal holiday
and consists of the time period from 12:01 a.m. through 12:00 Midnight, New York
City time.

     THE OFFER IS CONDITIONED UPON SATISFACTION OF THE MINIMUM TENDER CONDITION,
THE EXPIRATION OR TERMINATION PRIOR TO THE EXPIRATION DATE OF ANY WAITING PERIOD
UNDER THE HART-SCOTT-RODINO ANTITRUST IMPROVEMENTS ACT OF 1976, AS AMENDED (THE
"HSR ACT"), APPLICABLE TO THE PURCHASE OF SHARES PURSUANT TO THE OFFER AND
CERTAIN OTHER CONDITIONS. SEE SECTION 14. THE MERGER AGREEMENT AND THE OFFER MAY
BE TERMINATED BY PURCHASER AND PARENT IF CERTAIN EVENTS OCCUR. SEE SECTION 11.

     Purchaser reserves the right (but is not obligated), in accordance with
applicable rules and regulations of the Commission and subject to the
limitations set forth in the Merger Agreement described below, to waive any
condition to the Offer. Pursuant to the Merger Agreement, however, Purchaser has
agreed not to waive the Minimum Tender Condition without the consent of the
Company. If the Minimum Tender Condition or any condition set forth in Section
14 has not been satisfied by 12:00 Midnight, New York City time, on Tuesday,
February 29, 2000 (or any other time then set as the Expiration Date), Purchaser
may, subject to the terms of the Merger Agreement (including the requirement
that it obtain the Company's consent in connection with a waiver of the Minimum
Tender Condition, if applicable), elect to (1) extend the Offer and, subject to
applicable withdrawal rights, retain all tendered Shares until the expiration of
the Offer, as extended, (2) subject to complying with applicable rules and
regulations of the Commission, accept for payment all Shares so tendered and not
extend the Offer or (3) terminate the Offer and not accept for payment any
Shares and return all tendered Shares to tendering shareholders.

     Subject to the limitations set forth in this Offer, the Merger Agreement
and described below, Purchaser reserves the right (but is not obligated), at any
time or from time to time in its sole discretion, to extend the period during
which the Offer is open by giving oral or written notice of such extension to
the Depositary. There can be no assurance that Purchaser will exercise its right
to extend the Offer.

     Pursuant to the Merger Agreement, Purchaser may, without the consent of the
Company, (a) extend the Offer if at the Expiration Date any of the conditions to
the Offer have not been satisfied or waived, (b) extend the Offer for any period
required by any regulation of the Commission applicable to the Offer or (c)
elect to provide a subsequent offering period for the Offer in accordance with
Rule 14d-11 under the Securities Exchange Act of 1934, as amended (the "EXCHANGE
ACT"). In addition, the Share Price may be increased and the Offer may be
extended to the extent required by law in connection with such increase.

     Purchaser expressly reserves the right at any time and from time to time to
modify or amend the terms and conditions of the Offer in any respect. However,
pursuant to the Merger Agreement, Purchaser has agreed that it will not, without
the prior written consent of the Company, (a) decrease the Merger Consideration
or change the form of consideration payable in the Offer, (b) decrease the
number of Shares sought pursuant to the Offer, (c) impose additional conditions
to the Offer, (d) change the conditions of the Offer (provided that Parent or
Purchaser in its sole discretion may waive any conditions to the Offer other
than the Minimum

                                        6
<PAGE>   9

Tender Condition) or (e) make any other change in the terms or conditions of the
Offer which is adverse to the holders of Shares.

     Subject to the applicable rules and regulations of the Commission and
subject to the limitations set forth in the Merger Agreement, Purchaser
expressly reserves the right, at any time and from time to time, in its sole
discretion to delay payment for any Shares regardless of whether such Shares
were theretofore accepted for payment, or to terminate the Offer and not to
accept for payment or pay for any Shares not theretofore accepted for payment or
paid for, upon the occurrence of any of the conditions set forth in Section 14,
by giving oral or written notice of such delay or termination to the Depositary.
Purchaser's right to delay payment for any Shares or not to pay for any Shares
theretofore accepted for payment is subject to the applicable rules and
regulations of the Commission, including Rule 14e-1(c) under the Exchange Act,
relating to Purchaser's obligation to pay for or return tendered Shares promptly
after the termination or withdrawal of the Offer.

     Any extension of the period during which the Offer is open, delay in
acceptance for payment or payment, termination or amendment of the Offer will be
followed, as promptly as practicable, by public announcement thereof, such
announcement in the case of an extension to be issued not later than 9:00 a.m.,
New York City time, on the next business day after the previously scheduled
Expiration Date in accordance with the public announcement requirements of Rules
14d-4(c) and 14e-1(d) under the Exchange Act. Without limiting the obligation of
Purchaser under such rule or the manner in which Purchaser may choose to make
any public announcement, Purchaser currently intends to make announcements by
issuing a press release to the Dow Jones News Service (or such other national
media outlet or outlets it deems prudent) and making any appropriate filing with
the Commission.

     If, subject to the terms of the Merger Agreement, Purchaser makes a
material change in the terms of the Offer or the information concerning the
Offer, or if it waives a material condition of the Offer (including, with the
consent of the Company, a waiver of the Minimum Tender Condition), Purchaser
will disseminate additional tender offer materials and extend the Offer if and
to the extent required by Rules 14d-4(c), 14d-6(d) and 14e-1 under the Exchange
Act or otherwise. The minimum period during which a tender offer must remain
open following material changes in the terms of the Offer or the information
concerning the Offer, other than a change in the consideration offered or a
change in the percentage of securities sought, will depend upon the facts and
circumstances, including the relative materiality of the terms or information
changes. With respect to a change in the consideration offered or a change in
the percentage of securities sought, the Offer generally must remain open for a
minimum of 10 business days following such change to allow for adequate
disclosure to shareholders.

     Pursuant to Rule 14d-11 under the Exchange Act, Purchaser may, subject to
certain conditions, provide a subsequent offering period of from 3 business days
to 20 business days in length following the expiration of the Offer on the
Expiration Date ("SUBSEQUENT OFFERING PERIOD"). A Subsequent Offering Period
would be an additional period of time, following the expiration of the Offer and
the purchase of Shares in the Offer, during which shareholders may tender Shares
not tendered into the Offer. A Subsequent Offering Period, if one is included,
is not an extension of the Offer which already will have been completed.

     During a Subsequent Offering Period, tendering shareholders will not have
withdrawal rights and Purchaser will promptly purchase and pay for any Shares
tendered at the same price paid in the Offer. Rule 14d-11 provides that
Purchaser may provide a Subsequent Offering Period so long as, among other
things, (i) the initial 20 business day period of the Offer has expired, (ii)
Purchaser offers the same form and amount of consideration for Shares in the
Subsequent Offering Period as in the initial Offer, (iii) Purchaser accepts and
promptly pays for all securities tendered during the Offer prior to its
expiration, (iv) Purchaser announces the results of the Offer, including the
approximate number and percentage of Shares deposited in the Offer, no later
than 9:00 a.m. Eastern time on the next business day after the Expiration Date
and immediately begins the Subsequent Offering Period and (v) Purchaser
immediately accepts and promptly pays for Shares as they are tendered during the
Subsequent Offering Period. Purchaser will be able to include a Subsequent
Offering Period, if it satisfies the conditions above, after February 29, 2000.
In a public release, the Commission has expressed the view that the inclusion of
a Subsequent Offering Period would constitute a material change to the terms of
the Offer requiring Purchaser to disseminate new information to shareholders

                                        7
<PAGE>   10

in a manner reasonably calculated to inform them of such change sufficiently in
advance of the Expiration Date (generally five business days). In the event
Purchaser elects to include a Subsequent Offering Period, it will notify
shareholders of the Company consistent with the requirements of the Commission.

     PURCHASER DOES NOT CURRENTLY INTEND TO INCLUDE A SUBSEQUENT OFFERING PERIOD
IN THE OFFER, ALTHOUGH IT RESERVES THE RIGHT TO DO SO IN ITS SOLE DISCRETION.
PURSUANT TO RULE 14D-7 UNDER THE EXCHANGE ACT, NO WITHDRAWAL RIGHTS APPLY TO
SHARES TENDERED DURING A SUBSEQUENT OFFERING PERIOD AND NO WITHDRAWAL RIGHTS
APPLY DURING THE SUBSEQUENT OFFERING PERIOD WITH RESPECT TO SHARES TENDERED IN
THE OFFER AND ACCEPTED FOR PAYMENT. THE SAME CONSIDERATION, THE SHARE PRICE,
WILL BE PAID TO SHAREHOLDERS TENDERING SHARES IN THE OFFER OR IN A SUBSEQUENT
OFFERING PERIOD, IF ONE IS INCLUDED.

     The Company has provided Purchaser with the Company's list of stockholders
and security position listings for the purpose of disseminating the Offer to
holders of Shares. This Offer to Purchase and the related Letter of Transmittal
will be mailed to record holders of Shares whose names appear on the Company's
stockholder list and will be furnished to brokers, dealers, commercial banks,
trust companies and similar persons whose names, or the names of whose nominees,
appear on the stockholder list or, if applicable, who are listed as participants
in a clearing agency's security position listing, for subsequent transmittal to
beneficial owners of Shares.

2. ACCEPTANCE FOR PAYMENT AND PAYMENT FOR SHARES

     Upon the terms and subject to the conditions of the Offer (including, if
the Offer is extended or amended, the terms and conditions of any such extension
or amendment), Purchaser will accept for payment, and will pay for, Shares
validly tendered and not properly withdrawn as soon as practicable after the
Expiration Date. In addition, Purchaser expressly reserves the right, subject to
applicable rules of the Commission, to delay acceptance for payment of, or
payment for, Shares in order to comply, in whole or in part, with any applicable
law. See Sections 1 and 15. In all cases, payment for Shares tendered and
accepted for payment pursuant to the Offer will be made only after timely
receipt by the Depositary of (a) certificates for such Shares or confirmation of
the book-entry transfer of such Shares into the Depositary's account at The
Depository Trust Company (the "BOOK-ENTRY TRANSFER FACILITY") pursuant to the
procedures set forth in Section 3, (b) a Letter of Transmittal (or facsimile
thereof), properly completed and duly executed, with any required signature
guarantees (or, in the case of a book-entry transfer, an Agent's Message (as
defined in Section 3 below) in lieu of the Letter of Transmittal) and (c) any
other documents required by the Letter of Transmittal. See Section 3.

     For purposes of the Offer, Purchaser will be deemed to have accepted for
payment Shares validly tendered and not properly withdrawn if and when Purchaser
gives oral or written notice to the Depositary of its acceptance for payment of
such Shares pursuant to the Offer. Payment for Shares accepted for payment
pursuant to the Offer will be made by deposit of the purchase price therefor
with the Depositary, which will act as agent for the tendering shareholders for
purposes of receiving payments from Purchaser and transmitting such payments to
the tendering shareholders. UNDER NO CIRCUMSTANCES WILL INTEREST BE PAID ON THE
PURCHASE PRICE FOR SHARES, REGARDLESS OF ANY EXTENSION OF THE OFFER OR ANY DELAY
IN MAKING SUCH PAYMENT.

     The reservation by Purchaser of the right to delay the acceptance or
purchase of or payment for Shares is subject to the provisions of Rule 14e-1(c)
under the Exchange Act, which requires Purchaser to pay the consideration
offered or to return Shares deposited by or on behalf of tendering shareholders
promptly after the termination or withdrawal of the Offer.

     If any tendered Shares are not accepted for payment pursuant to the terms
and conditions of the Offer for any reason, or if certificates are submitted for
more Shares than are tendered, certificates for such unpurchased Shares will be
returned, without expense to the tendering shareholder (or, in the case of
Shares tendered by book-entry transfer into the Depositary's account at the
Book-Entry Transfer Facility pursuant to the procedures set forth in Section 3,
such Shares will be credited to an account maintained with the Book-Entry
Transfer Facility), as soon as practicable following expiration or termination
of the Offer.

                                        8
<PAGE>   11

     IF, PRIOR TO THE EXPIRATION DATE, PURCHASER SHALL INCREASE THE
CONSIDERATION OFFERED TO HOLDERS OF SHARES PURSUANT TO THE OFFER, SUCH INCREASED
CONSIDERATION SHALL BE PAID TO ALL HOLDERS OF SHARES THAT ARE PURCHASED PURSUANT
TO THE OFFER, WHETHER OR NOT SUCH SHARES WERE TENDERED PRIOR TO SUCH INCREASE IN
CONSIDERATION.

     Purchaser reserves the right to transfer or assign in whole or in part,
from time to time, to one or more direct or indirect subsidiaries of Parent the
right to purchase all or any portion of the Shares tendered pursuant to the
Offer, but any such transfer or assignment will not relieve Purchaser of its
obligations under the Offer and will in no way prejudice the rights of tendering
shareholders to receive payment for Shares validly tendered and accepted for
payment pursuant to the Offer. Under the Merger Agreement, Parent and Purchaser
may assign any of their respective rights and obligations to any of their direct
or indirect subsidiaries provided that such assignment will not relieve Parent
or Purchaser from their obligations under the Merger Agreement.

3. PROCEDURE FOR TENDERING SHARES

     Valid Tender.  To tender Shares pursuant to the Offer, either (a) a
properly completed and duly executed Letter of Transmittal (or a facsimile
thereof) in accordance with the instructions of the Letter of Transmittal, with
any required signature guarantees, certificates for the Shares to be tendered
and any other documents required by the Letter of Transmittal must be received
by the Depositary at one of its addresses set forth on the back cover of this
Offer to Purchase prior to the Expiration Date, (b) such Shares must be properly
delivered pursuant to the procedures for book-entry transfer described below and
a confirmation of such delivery received by the Depositary which confirmation
must include an Agent's Message (as defined below) if the tendering shareholder
has not delivered a Letter of Transmittal), prior to the Expiration Date, or (c)
the tendering shareholder must comply with the guaranteed delivery procedures
set forth below. The term "AGENT'S MESSAGE" means a message, transmitted by the
Book-Entry Transfer Facility to, and received by, the Depositary and forming a
part of a Book-Entry Confirmation (as defined below), which states that the
Book-Entry Transfer Facility has received an express acknowledgment from the
participant in the Book-Entry Transfer Facility tendering the Shares which are
the subject of such Book-Entry Confirmation that such participant has received
and agrees to be bound by the terms of the Letter of Transmittal and that
Purchaser may enforce such agreement against the participant.

     Until the close of business on the Distribution Date (as described in
Section 12), the Rights will be transferred with and only with the certificates
for Common Stock and the surrender for transfer of any certificates for Common
Stock will also constitute the transfer of the Rights associated with the Common
Stock represented by such certificate.

     Book-Entry Transfer.  The Depositary will establish an account with respect
to the Shares at the Book-Entry Transfer Facility for purposes of the Offer
within two business days after the date of this Offer to Purchase. Any financial
institution that is a participant in the Book-Entry Transfer Facility's systems
may make a book-entry transfer of Shares by causing the Book-Entry Transfer
Facility to transfer such Shares into the Depositary's account in accordance
with the Book-Entry Transfer Facility's procedures for such transfer. However,
although delivery of Shares may be effected through book-entry transfer, either
the Letter of Transmittal (or facsimile thereof), properly completed and duly
executed, together with any required signature guarantees, or an Agent's Message
in lieu of the Letter of Transmittal, and any other required documents, must, in
any case, be transmitted to and received by the Depositary at one of its
addresses set forth on the back cover of this Offer to Purchase by the
Expiration Date, or the tendering shareholder must comply with the guaranteed
delivery procedures described below. The confirmation of a book-entry transfer
of Shares into the Depositary's account at the Book-Entry Transfer Facility as
described above is referred to herein as a "BOOK-ENTRY CONFIRMATION." The Letter
of Transmittal, and any other documents required therein, must be transmitted to
and received by the Depositary at one of the addresses set forth on the back
cover of this Offer to Purchase. DELIVERY OF DOCUMENTS TO THE BOOK-ENTRY
TRANSFER FACILITY IN ACCORDANCE WITH THE BOOK-ENTRY TRANSFER FACILITY'S
PROCEDURES DOES NOT CONSTITUTE DELIVERY TO THE DEPOSITARY.

     Signature Guarantees and Stock Powers.  Except as otherwise provided below,
all signatures on a Letter of Transmittal must be guaranteed by a financial
institution (including most commercial banks, savings and

                                        9
<PAGE>   12

loan associations and brokerage houses) that is a participant in the Security
Transfer Agents Medallion Program, the New York Stock Exchange Medallion
Signature Guarantee Program or the Stock Exchange Medallion Program (an
"ELIGIBLE INSTITUTION"). Most commercial banks, savings and loans associations
and brokerage houses are Eligible Institutions. Signatures on a Letter of
Transmittal need not be guaranteed (a) if the Letter of Transmittal is signed by
the registered holder (which term, for purposes of this section, includes any
participant in any of the Book-Entry Transfer Facility's systems whose name
appears on a security position listing as the owner of the Shares) of Shares
tendered therewith and such registered holder has not completed the box entitled
"Special Payment Instructions" or the box entitled "Special Delivery
Instructions" on the Letter of Transmittal or (b) if such Shares are tendered
for the account of an Eligible Institution. See Instructions 1 and 5 of the
Letter of Transmittal. If the certificates for Shares are registered in the name
of a person other than the signer of the Letter of Transmittal, or if payment is
to be made or certificates for Shares not tendered or not accepted for payment
or are to be returned to a person other than the registered holder of the
certificates surrendered, then the tendered certificates must be endorsed or
accompanied by appropriate stock powers, in either case signed exactly as the
name or names of the registered holders or owners appear on the certificates,
with the signatures on the certificates or stock powers guaranteed as described
above. See Instructions 1 and 5 of the Letter of Transmittal.

     Guaranteed Delivery.  A shareholder who desires to tender Shares pursuant
to the Offer and whose certificates for Shares are not immediately available, or
who cannot comply with the procedure for book-entry transfer on a timely basis,
or who cannot deliver all required documents to the Depositary prior to the
Expiration Date, may tender such Shares by following all of the procedures set
forth below:

          (a) such tender is made by or through an Eligible Institution;

          (b) a properly completed and duly executed Notice of Guaranteed
     Delivery, substantially in the form provided by Purchaser, is received by
     the Depositary (as provided below) prior to the Expiration Date; and

          (c) the certificates for all tendered Shares, in proper form for
     transfer (or a Book-Entry Confirmation with respect to all such Shares),
     together with a properly completed and duly executed Letter of Transmittal
     (or facsimile thereof), with any required signature guarantees (or, in the
     case of a book-entry transfer, an Agent's Message in lieu of the Letter of
     Transmittal), and any other required documents, are received by the
     Depositary within three trading days after the date of execution of such
     Notice of Guaranteed Delivery. A "trading day" is any day on which The New
     York Stock Exchange, Inc. (the "NYSE") is open for business.

     The Notice of Guaranteed Delivery may be delivered by hand to the
Depositary or transmitted by telegram, facsimile transmission or mail to the
Depositary and must include a guarantee by an Eligible Institution in the form
set forth in such Notice of Guaranteed Delivery.

     THE METHOD OF DELIVERY OF SHARES, THE LETTER OF TRANSMITTAL AND ALL OTHER
REQUIRED DOCUMENTS, INCLUDING DELIVERY THROUGH THE BOOK-ENTRY TRANSFER FACILITY,
IS AT THE ELECTION AND RISK OF THE TENDERING SHAREHOLDER. DELIVERY OF ALL SUCH
DOCUMENTS WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY
(INCLUDING, IN THE CASE OF A BOOK-ENTRY TRANSFER, BY BOOK-ENTRY CONFIRMATION).
IF SUCH DELIVERY IS BY MAIL, IT IS RECOMMENDED THAT ALL SUCH DOCUMENTS BE SENT
BY PROPERLY INSURED REGISTERED MAIL WITH RETURN RECEIPT REQUESTED. IN ALL CASES,
SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.

     Other Requirements.  Notwithstanding any provision hereof, payment for
Shares accepted for payment pursuant to the Offer will in all cases be made only
after timely receipt by the Depositary of (a) certificates for (or a timely
Book-Entry Confirmation with respect to) such Shares, (b) a Letter of
Transmittal (or facsimile thereof), properly completed and duly executed, with
any required signature guarantees (or, in the case of a book-entry transfer, an
Agent's Message in lieu of the Letter of Transmittal) and (c) any other
documents required by the Letter of Transmittal. Accordingly, tendering
shareholders may be paid at different times depending upon when certificates for
Shares or Book-Entry Confirmations with respect to Shares are actually received
by the Depositary. UNDER NO CIRCUMSTANCES WILL INTEREST BE PAID BY PURCHASER ON
THE PURCHASE PRICE OF THE SHARES, REGARDLESS OF ANY EXTENSION OF THE OFFER OR
ANY DELAY IN MAKING SUCH PAYMENT.

                                       10
<PAGE>   13

     Tender Constitutes a Binding Agreement.  The valid tender of Shares
pursuant to one of the procedures described above will constitute a binding
agreement between the tendering shareholder and Purchaser upon the terms and
subject to the conditions of the Offer.

     Appointment as Proxy.  By executing and delivering a Letter of Transmittal
as set forth above (or, in the case of a book-entry transfer, by delivery of an
Agent's Message, in lieu of a Letter of Transmittal), the tendering shareholder
irrevocably appoints designees of Purchaser as such shareholder's proxies, each
with full power of substitution, to the full extent of such shareholder's rights
with respect to the Shares tendered by such shareholder and accepted for payment
by Purchaser and with respect to any and all other Shares or other securities
issued or issuable in respect of such Shares on or after January 24, 2000. All
such proxies and powers of attorney will be considered coupled with an interest
in the tendered Shares. Such appointment is effective when, and only to the
extent that, Purchaser deposits the payment for such Shares with the Depositary.
Upon the effectiveness of such appointment, all prior powers of attorney,
proxies and consents given by such shareholder will be revoked, and no
subsequent powers of attorney, proxies and consents may be given (and, if given,
will not be deemed effective). Purchaser's designees will, with respect to the
Shares for which the appointment is effective, be empowered to exercise all
voting and other rights of such shareholder as they, in their sole discretion,
may deem proper at any annual, special or adjourned meeting of the shareholders
of the Company, by written consent in lieu of any such meeting or otherwise.
Purchaser reserves the right to require that, in order for Shares to be deemed
validly tendered, immediately upon Purchaser's payment for such Shares,
Purchaser must be able to exercise full voting rights to the extent permitted
under applicable law with respect to such Shares.

     Determination of Validity.  All questions as to the validity, form,
eligibility (including time of receipt) and acceptance of any tender of Shares
will be determined by Purchaser in its sole and absolute discretion, which
determination will be final and binding. Purchaser reserves the absolute right
to reject any and all tenders determined by it not to be in proper form or the
acceptance for payment of or payment for which may, in the opinion of Purchaser,
be unlawful. Purchaser also reserves the absolute right to waive any defect or
irregularity in the tender of any Shares of any particular shareholder whether
or not similar defects or irregularities are waived in the case of any other
shareholder. No tender of Shares will be deemed to have been validly made until
all defects and irregularities relating thereto have been cured or waived. None
of Parent, Purchaser, the Depositary, the Information Agent or any other person
will be under any duty to give notification of any defects or irregularities in
tenders or incur any liability for failure to give any such notification.
Purchaser's interpretation of the terms and conditions of the Offer (including
the Letter of Transmittal and Instructions and any other related documents
thereto) will be final and binding.

4. WITHDRAWAL RIGHTS

     Except as otherwise provided in this Section 4, tenders of Shares made
pursuant to the Offer are irrevocable, except that Shares tendered pursuant to
the Offer may be withdrawn at any time prior to the Expiration Date and, unless
theretofore accepted for payment by Purchaser pursuant to the Offer, may also be
withdrawn at any time after April 1, 2000.

     For a withdrawal of shares to be effective, a written facsimile
transmission notice of withdrawal must be timely received by the Depositary at
one of its addresses set forth on the back cover of this Offer to Purchase. Any
notice of withdrawal must specify the name of the person having tendered the
Shares to be withdrawn, the number of Shares to be withdrawn and the name of the
recordholder of the Shares to be withdrawn, if different from that of the person
who tendered such Shares. The signature(s) on the notice of withdrawal must be
guaranteed by an Eligible Institution, unless such Shares have been tendered for
the account of any Eligible Institution. If Shares have been tendered pursuant
to the procedures for book-entry transfer as set forth in Section 3, any notice
of withdrawal must specify the name and number of the account at the Book Entry
Transfer Facility to be credited with the withdrawn Shares. If certificates have
been delivered or otherwise identified to the Depositary, the name of the
registered holder and the serial numbers shown on such certificates must also be
furnished to the Depositary as aforesaid prior to the physical release of such
certificates.

                                       11
<PAGE>   14

     All questions as to the form and validity (including time of receipt) of
any notice of withdrawal will be determined by Purchaser, in its sole
discretion, which determination shall be final and binding. No withdrawal of
Shares shall be deemed to have been properly made until all defects and
irregularities have been cured or waived. None of Purchaser, Parent, the
Depositary, the Information Agent or any other person will be under any duty to
give notification of any defects or irregularities in any notice of withdrawal
or incur any liability for failure to give such notification. Withdrawals of
tenders of Shares may not be rescinded, and any Shares properly withdrawn will
be deemed not to have been validly tendered for purposes of the Offer. However,
withdrawn Shares may be retendered by following one of the procedures described
in Section 3 at any time prior to the Expiration Date.

     If Purchaser extends the Offer, is delayed in its acceptance for payment of
Shares or is unable to accept for payment Shares pursuant to the Offer for any
reason, then, without prejudice to Purchaser's rights under this Offer, the
Depositary may, nevertheless, on behalf of Purchaser, retain tendered Shares,
and such Shares may not be withdrawn except to the extent that tendering
shareholders are entitled to withdrawal rights as set forth in this Section 4.

     In the event Purchaser provides a Subsequent Offering Period following the
Offer, no withdrawal rights will apply to Shares tendered during such Subsequent
Offering Period or to Shares tendered in the Offer and accepted for payment.

5. CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES OF THE OFFER

     The following is a summary of the material United States federal income tax
consequences of the sale of Shares pursuant to the Offer and the exchange of
Shares for cash pursuant to the Merger to the Company's shareholders. This
summary does not purport to be a description of all tax consequences that may be
relevant to the Company's shareholders, and assumes an understanding of tax
rules of general application. It does not address special rules which may apply
to the Company's shareholders based on their tax status, individual
circumstances or other factors unrelated to the Offer or the Merger.
Shareholders are encouraged to consult their own tax advisors regarding the
Offer and the Merger.

     The receipt of cash in exchange for Shares pursuant to the Offer or the
Merger will be a taxable transaction for federal income tax purposes, and may
also be taxable under applicable state, local, foreign and other tax laws. For
federal income tax purposes, a shareholder whose Shares are purchased pursuant
to the Offer or who receives cash as a result of the Merger will realize gain or
loss equal to the difference between the adjusted basis of the Shares sold or
exchanged and the amount of cash received therefor. Such gain or loss will be
capital gain or loss if the Shares are held as capital assets by the shareholder
and will be long-term capital gain or loss if the shareholder's holding period
in such Shares for federal income tax purposes is more than one year at the time
of the sale or exchange. Long-term capital gain of a non-corporate shareholder
is generally subject to a maximum tax rate of 20 percent. In addition, a
shareholder's ability to use capital losses to offset ordinary income is
limited.

     Backup Withholding.  Under the federal income tax backup withholding rules,
unless an exemption applies, Purchaser is required to, and will, withhold 31
percent of all payments to which a shareholder is entitled pursuant to the
Offer, unless such shareholder provides a tax identification number and
certifies under penalties of perjury that the number is correct. If a
shareholder is an individual, the tax identification number is a social security
number. If a shareholder is not an individual, the tax identification number is
an employer identification number. Each shareholder should complete and sign the
substitute Form W-9, which will be included with the Letter of Transmittal to be
returned to the Depositary, in order to provide the information and
certification necessary to avoid backup withholding, unless an applicable
exception exists and is proved in a manner satisfactory to the Depositary.
Certain shareholders, including corporations and some foreign individuals, are
not subject to these backup withholding and reporting requirements. In order for
a foreign individual to qualify as an exempt recipient, however, he or she must
submit a Certificate of Foreign Status on Form W-8BEN attesting to his or her
exempt status. Any amounts withheld will be allowed as a credit against the
holder's federal income tax liability for that year.

                                       12
<PAGE>   15

     The foregoing discussion is included for general information purposes and
may not apply to shareholders who acquired their Shares pursuant to the exercise
of employee stock options or other compensation arrangements with the Company,
or who are not citizens or residents of the United States or who are otherwise
subject to special tax treatment. The tax discussion above is based upon laws,
regulations, rulings and decisions now in effect, all of which are subject to
change, possibly retroactively. Each shareholder is urged to consult his, her or
its own tax advisor with respect to the tax consequences of the Offer and the
Merger, including the application and effect of state, local, foreign or other
tax laws.

6. PRICE RANGE OF SHARES; DIVIDENDS

     The Shares of Common Stock are listed on the NYSE under the symbol "CPU."
The following table sets forth, for the calendar quarters indicated, the high
and low sales prices for the Common Stock on the NYSE:

<TABLE>
<CAPTION>
CALENDAR YEAR                                                 HIGH    LOW
- -------------                                                 ----    ---
<S>                                                           <C>     <C>
1998:
First Quarter...............................................  $35 3/8 $24 1/4
Second Quarter..............................................  $22     $14 1/2
Third Quarter...............................................  $21 3/4 $11 1/4
Fourth Quarter..............................................  $17 1/16 $10 9/16
1999:
First Quarter...............................................  $14 15/16 $ 5 9/16
Second Quarter..............................................  $ 9 1/16 $ 5 13/16
Third Quarter...............................................  $ 8 1/16 $ 5 5/16
Fourth Quarter..............................................  $ 7     $ 5
2000:
First Quarter (through January 28, 2000)....................  $10     $ 4 7/8
</TABLE>

     The Rights trade together with the Common Stock. On January 21, 2000, the
last full trading day prior to the public announcement of the terms of the Offer
and the Merger, the reported closing price per Share on the NYSE was $6 3/4 per
Share. On January 31, 2000, the last full trading day prior to the commencement
of the Offer, the reported closing price per Share of Common Stock on the NYSE
was $9 5/8 per Share. The Company has not paid any dividends since January 1,
1998. SHAREHOLDERS ARE URGED TO OBTAIN A CURRENT MARKET QUOTATION FOR THE
SHARES.

7. POSSIBLE EFFECTS OF THE OFFER ON THE MARKET FOR THE SHARES; NYSE LISTING;
   MARGIN REGULATIONS AND EXCHANGE ACT REGISTRATION

     Possible Effects of the Offer on the Market for the Shares.  The purchase
of Shares pursuant to the Offer will reduce the number of Shares that might
otherwise trade publicly and could adversely affect the liquidity and market
value of the remaining Shares held by the public.

     NYSE Listing.  Depending upon the number of Shares purchased pursuant to
the Offer, the Shares may no longer meet the standards for continued listing on
the NYSE. According to its published guidelines, the NYSE would give
consideration to delisting the Shares if, among other things, the number of
publicly held Shares falls below 600,000, the number of holders of round lots of
Shares falls below 400 (or below 1,200 if the average monthly trading volume is
below 100,000 for the last twelve months) or the aggregate market value of such
publicly held Shares falls below $8,000,000. Shares held by officers or
directors of the Company or their immediate families, or by any beneficial owner
of more than 10 percent or more of the Shares, ordinarily will not be considered
as being publicly held for this purpose.

     In the event the Shares are no longer eligible for listing on the NYSE,
quotations might still be available from other sources. The extent of the public
market for the Shares and the availability of such quotations would, however,
depend upon the number of holders of such shares at such time, the interest in
maintaining a

                                       13
<PAGE>   16

market in such Shares on the part of securities firms, the possible termination
of registration of such Shares under the Exchange Act as described below and
other factors.

     Margin Regulation.  The Shares are presently "margin securities" under the
regulations of the Board of Governors of the Federal Reserve System (the
"FEDERAL RESERVE BOARD"), which has the effect, among other things, of allowing
brokers to extend credit using such Shares as collateral. Depending upon factors
similar to those described above regarding listing and market quotations, the
Shares might no longer constitute "margin securities" for the purposes of the
Federal Reserve Board's margin regulations in which event the Shares would be
ineligible as collateral for margin loans made by brokers.

     Exchange Act Registration.  The Shares are currently registered under the
Exchange Act. Such registration may be terminated by the Company upon
application to the Commission if the outstanding Shares are not listed on a
national securities exchange and if there are fewer than 300 holders of record
of Shares. Termination of registration of the Shares under the Exchange Act
would reduce the information required to be furnished by the Company to its
shareholders and to the Commission and would make certain provisions of the
Exchange Act, such as the short-swing profit recovery provisions of Section
16(b) and the requirement of furnishing a proxy statement in connection with
shareholders' meetings pursuant to Section 14(a) and the related requirement of
furnishing an annual report to shareholders, no longer applicable with respect
to the Shares. Furthermore, the ability of "affiliates" of the Company and
persons holding "restricted securities" of the Company to dispose of such
securities pursuant to Rule 144 under the Securities Act of 1933, as amended,
may be impaired or eliminated. If registration of the Shares under the Exchange
Act were terminated, the Shares would no longer be eligible for NYSE reporting
or for continued inclusion on the Federal Reserve Board's list of "margin
securities." Purchaser intends to seek to cause the Company to apply for
termination of registration of the Shares as soon as possible after consummation
of the Offer if the requirements for termination of registration are met.

8. CERTAIN INFORMATION CONCERNING THE COMPANY

     The Company is one of the leading retailers and resellers of personal
computers and related products and services, principally through its Computer
Superstores (SM) located throughout the United States. In addition to the retail
sales of its stores, the Company's operations also include direct sales to
corporate, government and education customers. In addition, the Company
currently conducts a retail Internet sales operation through its wholly-owned
subsidiary, cozone.com inc., and sells build-to-order desktop and notebook
personal computers and servers through its wholly-owned subsidiary, CompUSA PC
Inc. The Company also provides training and technical services to its retail and
corporate, government, and education customers. The Company's principal
executive offices are located at 14951 North Dallas Parkway, Dallas, TX 75240
and the Company's telephone is (972) 984-4000.

     Set forth below is certain summary consolidated financial information for
the Company's last three fiscal years, as contained in the Company's Annual
Report on Form 10-K/A for the fiscal year ended June 26, 1999, and for the
thirteen weeks ended September 26, 1998 and September 25, 1999, as contained in
the Company's Quarterly Report on Form 10-Q for the quarter ended September 25,
1999 as well as certain unaudited financial highlights of operating results for
the thirteen and twenty-six weeks ended December 25, 1999 and December 26, 1998,
which have been furnished by the Company for inclusion in this Offer to
Purchase. More comprehensive financial information is included in such reports
(including management's discussion and analysis of financial condition and
results of operation) and other documents filed by the Company with the
Commission, and the following summary is qualified in its entirety by reference
to such reports and other documents and all of the financial information and
notes contained therein. Copies of such reports and other documents may be
examined at or obtained from the Commission in the manner set forth below.

                                       14
<PAGE>   17

                                  COMPUSA INC.

                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
       (IN THOUSANDS, EXCEPT PER SHARE DATA AND SELECTED OPERATING DATA)

<TABLE>
<CAPTION>
                                                FISCAL YEAR ENDED(1)              THIRTEEN WEEKS ENDED
                                       ---------------------------------------   -----------------------
                                                                                       (UNAUDITED)
                                         JUNE, 26,      JUNE 27,     JUNE 28,    SEPT. 25,    SEPT. 26,
                                       1999(2)(3)(4)    1998(2)      1997(2)      1999(2)      1998(2)
                                       -------------   ----------   ----------   ----------   ----------
<S>                                    <C>             <C>          <C>          <C>          <C>
STATEMENT OF OPERATIONS DATA:
Net sales............................   $6,248,518     $5,219,196   $4,552,046   $1,347,246   $1,375,439
Cost of sales and occupancy costs....    5,459,471      4,491,446    3,910,862    1,143,850    1,182,823
                                        ----------     ----------   ----------   ----------   ----------
Gross profit.........................      789,047        727,750      641,184      203,396      192,616
Operating expenses...................      659,444        504,374      398,797      171,858      145,664
Pre-opening expenses.................        4,461          8,704        6,220        1,679        1,366
General and administrative
  expenses...........................      170,048        116,399       92,183       46,749       32,637
Restructuring charge(4)..............       20,938             --           --       (2,176)          --
Non-recurring amortization
  charge(5)..........................           --         55,885           --           --           --
                                        ----------     ----------   ----------   ----------   ----------
Operating income (loss)..............      (65,844)        42,388      143,984      (14,714)      12,949
Interest expense.....................       25,906         12,331       12,229        6,752        4,383
Other income, net....................       (6,926)        (6,463)      (7,900)        (814)      (1,540)
                                        ----------     ----------   ----------   ----------   ----------
Income (loss) before income taxes....      (84,824)        36,520      139,655      (20,652)      10,106
Income tax expense (benefit).........      (31,810)        14,058       53,768       (7,744)       3,874
                                        ----------     ----------   ----------   ----------   ----------
Net income (loss)....................   $  (53,014)    $   22,462   $   85,887   $  (12,908)  $    6,232
Net income (loss) per common share
  Basic..............................   $    (0.58)    $     0.25   $     0.95   $    (0.14)  $     0.07
  Diluted............................   $    (0.58)    $     0.24   $     0.91   $    (0.14)  $     0.07
Weighted average common shares.......       91,490         91,369       90,835       92,700       91,243
Weighted average common shares
  assuming dilution..................       91,490         94,616       94,589       92,700       93,041
SELECTED OPERATING DATA:
Computer Superstores open at end of
  period.............................          211            162          129          213          203
Average net sales per gross square
  foot(6)............................   $    1,126     $    1,273   $    1,346   $      235   $      278
Total gross square footage at end of
  period.............................    5,598,000      4,467,400    3,507,800    5,664,700    5,314,200
Percentage increase (decrease) in
  comparable store sales(7)..........         (3.3)%          1.7%         5.3%        (0.0)%       (1.6)%
BALANCE SHEET DATA:
Cash and cash equivalents............   $  173,350     $  151,779   $  209,929   $  128,322   $  151,129
Working capital......................      142,111        282,355      361,923      149,808      322,709
Property and equipment, net..........      227,113        210,528      170,801      253,367      229,279
Total assets.........................    1,481,715      1,172,016    1,130,411    1,399,547    1,613,240
Long-term debt, excluding current
  portion............................      136,169        111,872      112,458      186,066      247,729
Stockholders' equity.................      350,476        396,261      418,671      337,571      402,877
</TABLE>

                                       15
<PAGE>   18

- ---------------
(1) The Company's fiscal year is a 52/53 week year ending on the last Saturday
    of each June. The Company's fiscal years ended June 26, 1999, June 27, 1998
    and June 28, 1997, each of which contained fifty-two weeks.

(2) The Company changed its accounting policy with respect to the recognition of
    revenues and related direct selling expenses from the sale of certain
    extended service plans effective as of the beginning of fiscal 2000. As a
    result of the change in accounting policy, the Company has restated its
    financial statements for the three fiscal years in the period ended June 26,
    1999 and for the thirteen weeks ended September 26, 1998 as presented
    herein. See Note 2 of Notes to Consolidated Financial Statements as
    contained in the Company's Annual Report on Form 10-K/A for the fiscal year
    ended June 26, 1999.

(3) On August 31, 1998, the Company acquired Computer City, Inc. from Tandy
    Corporation. Following the acquisition, the Company operated 37 former
    Computer City stores as CompUSA Computer Superstores and two former Computer
    City "small market" stores in fiscal 1999. Of the 37 former Computer City
    stores operated as CompUSA Computer Superstores, the Company closed four of
    such stores in July 1999. The acquisition of Computer City has been
    accounted for under the purchase accounting method. See Note 5 of Notes to
    Consolidated Financial Statements contained in the Company's Annual Report
    on Form 10-K/A for the fiscal year ended June 26, 1999.

(4) For a discussion of the Company's fiscal 1999 non-recurring and
    restructuring charges, see Note 3 of Notes to Consolidated Financial
    Statements contained in the Company's Annual Report on Form 10-K/ A for the
    fiscal year ended June 26, 1999.

(5) For a discussion of the Company's fiscal 1998 non-recurring amortization
    charge, see Note 4 of Notes to Consolidated Financial Statements contained
    in the Company's Annual Report on Form 10-K/A for the fiscal year ended June
    26, 1999.

(6) Calculated using net sales divided by gross square footage of Computer
    Superstores open at the end of the period, weighted by the number of months
    open during the period. For purposes of calculating average net sales per
    gross square foot, net sales are comprised of net sales generated from the
    Company's Computer Superstores as well as the net sales of the Company's
    national accounts group to corporate, government, and education customers,
    but exclude sales of CompUSA Net.com.

(7) Comparable store sales are net sales for the Computer Superstores open the
    same months in both the indicated and previous periods, including stores
    that were relocated or expanded during either period. For purposes of
    calculating the change in comparable store sales, net sales are comprised of
    net sales generated from the Company's Computer Superstores as well as the
    net sales of the Company's national accounts group to corporate, government,
    and education customers, but exclude sales of CompUSA Net.com. The sales of
    the 37 former Computer City stores are not included in the calculation of
    the change in comparable store sales for fiscal 1999. The comparable store
    sales increase for fiscal 1997 was calculated by comparing net sales for the
    fifty-two weeks ended June 28, 1997 with net sales for the fifty-two weeks
    ended June 29, 1996.

                                  COMPUSA INC.

                        FINANCIAL HIGHLIGHTS (UNAUDITED)

<TABLE>
<CAPTION>
                                          FOR THE THIRTEEN WEEKS ENDED    FOR THE TWENTY-SIX WEEKS ENDED
                                          ----------------------------    ------------------------------
                                          DECEMBER 25,    DECEMBER 26,    DECEMBER 25,     DECEMBER 26,
                                              1999            1998            1999             1998
                                          ------------    ------------    -------------    -------------
                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                       <C>             <C>             <C>              <C>
Net sales...............................   $1,383,738      $1,753,776      $2,730,984       $3,129,215
Net income (loss).......................       (2,038)         12,869         (14,946)          19,101
Net income (loss) per share:
  Basic.................................        (0.02)           0.14           (0.16)            0.21
  Diluted...............................        (0.02)           0.14           (0.16)            0.21
</TABLE>

                                       16
<PAGE>   19

     Except as otherwise set forth herein, the information concerning the
Company contained in this Offer to Purchase has been taken from or based upon
publicly available documents and records on file with the Commission and other
public sources and is qualified in its entirety by reference thereto. Although
Parent has no knowledge that would indicate that any statements contained herein
taken from or based on such documents and records are untrue, Parent cannot take
responsibility for the accuracy or completeness of the information contained in
such documents and records, or for any failure by the Company to disclose events
which may have occurred or may affect the significance or accuracy of any such
information but which are unknown to Parent.

     The Company is subject to the information and reporting requirements of the
Exchange Act and in accordance therewith is obligated to file reports and other
information with the Commission relating to its business, financial condition
and other matters. Information, as of particular dates, concerning the Company's
directors and officers, their remuneration, stock options granted to them, the
principal holders of the Company's securities, any material interests of such
persons in transactions with the Company and other matters is required to be
disclosed in proxy statements distributed to the Company's shareholders and
filed with the Commission. Such reports, proxy statements and other information
should be available for inspection at the public reference room at the
Commission's office 450 Fifth Street, N.W., Room 1024, Judiciary Plaza,
Washington, D.C., and also should be available for inspection and copying at the
following regional offices of the Commission: 7 World Trade Center, Suite 1300,
New York, New York 10048 and Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661-2511. Copies may be obtained by mail, upon payment
of the Commission's customary charges, by writing to its principal office at 450
Fifth Street, N.W., Room 1024, Judiciary Plaza, Washington, D.C. 20549. Further
information on the operation of the Commission's Public Reference Room in
Washington, D.C. can be obtained by calling the Commission at
1-800-Commission-0330. The Commission also maintains an Internet worldwide web
site that contains reports, proxy statements and other information about
issuers, such as the Company, who file electronically with the Commission. The
address of that site is http://www.sec.gov.

9. CERTAIN INFORMATION CONCERNING PURCHASER AND PARENT

     Purchaser is a Delaware corporation and, to date, has engaged in no
activities other than those incident to its formation and the Offer and the
Merger. Purchaser is currently an indirect wholly-owned subsidiary of Parent.
The principal executive offices of Purchaser are located at 1000 Louisiana
Street, Suite 565, Houston, Texas 77002 and Purchaser's telephone number is
713-951-9700.

     Parent is a corporation (sociedad anonima de capital variable) organized
under the laws of the United Mexican States. It is a holding company with one of
the leading retail brand portfolios in Mexico and an expanding presence in
e-commerce. Parent owns and operates 305 stores in major cities across Mexico,
including Sanborns, Sanborns Cafe, Sears Roebuck de Mexico, Pasteleria el Globo,
Mix-up and Discolandia. Parent also produces food and manufactures
household/personal care items sold throughout Mexico and has over 30,000
employees. Parent's e-commerce initiatives include a shopping portal for
Sanborns products. The principal executive offices of Parent are located at
Avenida San Fernando 649, Colonia Pena Pobre Tlalpan, Mexico, D.F, 14060 and
Parent's telephone number is 011-525-325-9186.

     Carso, a corporation organized under the laws of the United Mexican States,
owns approximately 79 percent of the outstanding voting equity securities of
Parent, and may be deemed to control Parent. The remainder of Parent's equity
securities are publicly held and listed on the Mexican Stock Exchange. Carso is
a holding company with interests in the tobacco, mining, metallurgical and paper
industries, in the operation of restaurants and department stores (through
Parent) and in the production of copper, copper alloys, copper cable and
aluminum wires. The principal executive offices of Carso are located at
Insurgentes Sur 1500, Colonia Pena Pobre Tlalpan, Mexico, D.F., 14060 and
Carso's telephone number is 011-525-726-3675. Mr. Carlos Slim Helu, Mr. Carlos
Slim Domit, Mr. Marco Antonio Slim Domit, Mr. Patrick Slim Domit, Ms. Maria
Soumaya Slim Domit, Ms. Vanessa Paola Slim Domit and Ms. Johanna Monique Slim
Domit (collectively, the "SLIM FAMILY"), through a Mexican corporation and a
Mexican trust, beneficially own approximately 61 percent of the outstanding
voting equity securities of Carso and may be deemed to control Carso and thus to
be ultimately in control of Parent and Purchaser.

                                       17
<PAGE>   20

     Except for 13,750,000 Shares owned by Parent and which may be deemed to be
beneficially owned by Carso and the Slim Family, none of Parent or Purchaser
nor, to the best of Parent's and Purchaser's knowledge, any of Carso, the Slim
Family or the persons listed in Schedule A hereto (except as indicated in such
Schedule) or any associate or majority-owned subsidiary of Parent or Purchaser,
beneficially owns or has a right to acquire any securities of the Company or has
any contract, arrangement, understanding or relationship with any other person
with respect to any securities of the Company, including, but not limited to,
any contract, arrangement, understanding or relationship concerning the transfer
or the voting of any securities of the Company, joint venture, loan or option
arrangements, puts or calls, guarantees of loans, guarantees against loss, or
the giving or withholding of proxies, or has affected any transaction in the
securities of the Company during the past 60 days.

     Except as set forth in this Offer to Purchase, since January 1, 1998,
neither Parent or Purchaser nor, to the best of Parent's and Purchaser's
knowledge, any of Carso, the Slim Family or the persons listed on Schedule A
hereto, has had any business transactions with the Company or any of its
executive officers, directors or affiliates that is required to be reported
under the rules and regulations of the Commission applicable to the Offer.
Except as set forth in this Offer to Purchase, since January 1, 1998, there have
been no material contacts, negotiations or transactions between Parent,
Purchaser or any of their affiliates or, to the best of Parent's and Purchaser's
knowledge, any of Carso, the Slim Family or the persons listed in Schedule A to
this Offer to Purchase, on the one hand, and the Company or its affiliates, on
the other hand, concerning a merger, consolidation or acquisition; a tender
offer for or other acquisition of securities of any class of the Company's
securities, an election of directors of the Company; or a sale or other transfer
of a material amount of assets of the Company.

10. BACKGROUND OF THE OFFER; CONTACTS WITH THE COMPANY

     Beginning in mid-August 1999, Parent began purchasing shares of Common
Stock in open market transactions on the NYSE. On September 10, 1999, Parent and
its affiliates reported publicly their ownership of approximately 14.8 percent
of the then-outstanding Shares.

     On September 13, 1999, Mr. James F. Halpin, President and Chief Executive
Officer of the Company, contacted representatives of Parent and discussed in
general terms Parent's investment in the Company. During this discussion, Mr.
Halpin proposed that the parties meet the following day in Mexico City.

     On September 14, 1999, Mr. Halpin and other representatives of the Company
met with Mr. Carlos Slim Domit, Chief Executive Officer of Parent, and other
representatives of Parent in Mexico City and continued their discussions of
Parent's investment in the Company. The parties also discussed the possibility
of establishing various commercial arrangements between the Company and Parent
and its affiliates, including joint ventures. During this visit, representatives
of the Company toured several of Parent's retail stores in Mexico City.

     During the week of September 20, 1999, representatives of Parent visited
the Company's headquarters in Dallas, Texas and toured several of the Company's
stores. During this week, representatives of Parent indicated to representatives
of the Company that Parent would be interested in increasing its investment in
the Company. In light of provisions under Delaware law restricting certain
transactions between Delaware corporations and persons holding 15 percent or
more of their outstanding voting stock, representatives of Parent requested that
the Company consider taking the necessary corporate action to make these
restrictions inapplicable to an increased Parent investment, provided that
Parent and its affiliates agreed to limit their investment to less than 20
percent of the outstanding Shares. Mr. Halpin advised Parent that the Company
would consider taking such action only if Parent entered into a confidentiality
and "standstill" agreement with the Company. The representatives of Parent
indicated that they would consider the possibility of entering into such an
agreement, and requested that the Company prepare a draft agreement.

     On October 1, 1999, the Company furnished Parent with a draft
confidentiality and "standstill" agreement and, on October 22, 1999, Parent
informed the Company that Parent was not interested in entering into the
agreement on the terms proposed by the Company.

                                       18
<PAGE>   21

     On October 5-6, representatives of the Company met with representatives of
Parent in Mexico City to discuss the voting of the Shares owned by Parent at the
upcoming annual shareholder meeting of the Company.

     On November 5, 1999, Mr. Halpin met with representatives of Parent in
Mexico City. During this meeting the parties discussed the possibility of
establishing various commercial arrangements between the Company and Parent and
its affiliates, and representatives of Parent indicated in general terms that
Parent continued to be interested in exploring the possibility of increasing its
investment in the Company.

     During the week of November 29, 1999, in a telephone call, representatives
of Parent advised representatives of the Company that Parent would be interested
in exploring the possibility of making a proposal to acquire the Company at a
valuation of approximately $7.00 to $7.50 per Share, although no specific
proposal was made. Mr. Halpin responded that the Company would consider a
proposal at such a valuation to be inadequate.

     On December 3, 1999, in a telephone call and on December 8-9, 1999 at
meetings in Mexico City, representatives of Parent indicated that Parent would
consider increasing its valuation to approximately $8.00 per Share for the
Company, although again no specific proposal was made. Mr. Halpin indicated that
such a valuation would still be considered inadequate by the Company.

     On December 16, 1999, a representative of Parent met again with Mr. Halpin
and other representatives of the Company in Dallas, Texas to continue their
discussions. At this meeting, the parties concluded that they had differing
views with respect to the valuation of the Company and agreed to defer further
discussions.

     During the week of January 3, 2000, representatives of Parent and the
Company reopened discussions regarding possible commercial arrangements between
the Company and an affiliate of Parent.

     During the week of January 10, 2000, representatives of Parent suggested to
Mr. Halpin that they might consider making an acquisition proposal at a
valuation of up to $9.00 per Share. Mr. Halpin informed Parent that he would
discuss the matter with the Company's Board of Directors.

     On January 18, 2000, Credit Suisse First Boston informed representatives of
Parent that the Company would not be receptive to a proposal involving a
valuation of $9.00 per Share. On January 19, 2000, Credit Suisse First Boston
discussed various prices and transaction terms with representatives of Parent.
During these discussions representatives of Parent advised Credit Suisse First
Boston that Parent would consider making a proposal to acquire the Company at a
valuation of approximately $9.50 per Share and, after continued discussions,
Parent incrementally increased such valuations to $10.10 per Share. Credit
Suisse First Boston indicated that it would discuss such proposal with the
Company's Board of Directors. On January 21, 2000, Parent submitted to the
Company a proposed merger agreement and the parties and their legal advisors met
in New York to continue to negotiate the terms of the proposed acquisition. On
January 22-23, 2000, the parties concluded negotiating the terms of the Merger
Agreement and related documents.

     At a meeting held on January 23, 2000, the Company's Board of Directors
unanimously approved the Merger Agreement, the Offer and the Merger, determined
that the Offer and the Merger are advisable and fair to, and in the best
interest of, the holders of Shares (other than Parent and its affiliates) and
unanimously resolved to recommend that shareholders accept the Offer and tender
their Shares pursuant to the Offer. The Company, Parent and Purchaser executed
the Merger Agreement on January 23, 2000.

     On January 24, 2000, prior to the opening of trading on the NYSE, Parent
and the Company issued a joint press release announcing the execution of the
Merger Agreement. On February 1, 2000, Purchaser commenced the Offer.

                                       19
<PAGE>   22

11. PURPOSE OF THE OFFER; PLANS FOR THE COMPANY; THE MERGER AGREEMENT AND
    EXECUTIVE EMPLOYMENT AGREEMENTS

     Purpose.  The purpose of the Offer and the Merger is to acquire control of,
and the entire equity interest in, the Company. The Offer, as the first step in
the acquisition of the Company, is intended to facilitate the acquisition of all
outstanding Shares. The purpose of the Merger is to acquire all of the capital
stock of the Company not purchased pursuant to the Offer or otherwise. If
Purchaser owns two-thirds of the issued and outstanding Shares following the
consummation of the Offer, it will have the ability under the DGCL to approve
the Merger without the approval of the holders of any other Shares, although a
shareholder vote may be necessary. If, however, after consummation of the Offer,
Purchaser owns at least 90 percent of the Shares then outstanding, Purchaser
will be able to cause the Merger to occur without a vote of the Company's
shareholders.

     Plans for the Company.  In connection with the Offer, Parent and Purchaser
have reviewed, and will continue to review, various possible business strategies
that they might consider in the event that Purchaser acquires control of the
Company, whether pursuant to the Offer, the Merger or otherwise. Such strategies
could include, among other things, changes in the Company's business, corporate
structure, capitalization or management.

     The Merger Agreement.  The following is a summary of certain provisions of
the Merger Agreement and the amendments to certain Executive Employment
Agreements dated January 23, 2000, between the Company and certain of its
executives officers (the "EXECUTIVE EMPLOYMENT AGREEMENTS") entered into in
connection with the Merger Agreement. This summary is qualified in its entirety
by reference to the Merger Agreement and the Executive Employment Agreements
which are incorporated herein by reference and copies or forms of which have
been filed with the Commission as exhibits to the Tender Offer Statement on
Schedule TO to which this Offer to Purchase is an exhibit (the "SCHEDULE TO").
The Merger Agreement and the Executive Employment Agreements may be examined and
copies may be obtained in the manner set forth in Section 8. Defined terms used
herein and not defined herein have the meanings assigned to those terms in the
Merger Agreement.

     The Offer.  The Merger Agreement provides that Purchaser will commence the
Offer and that, upon the terms and subject to prior satisfaction or waiver of
the conditions set forth in the Offer as described in Section 14 (including, if
the Offer is extended or amended, the terms and conditions of any extension or
amendment), Purchaser will accept for payment, and pay for, all Shares validly
tendered pursuant to the Offer and not withdrawn on or prior to the Expiration
Date.

     Directors.  Pursuant to the Merger Agreement, after Purchaser has purchased
Shares pursuant to the Offer, and from time to time thereafter, Purchaser has
the right to have persons designated by it become directors of the Company so
that the total number of such persons equals the number, rounded up to the next
whole number, which is the product of the total number of directors on the Board
of Directors of the Company and the percentage that the number of Shares
purchased bears to the total number of Shares then outstanding, provided that
the Board of Directors of the Company must include at least two Continuing
Directors (as defined below). The Merger Agreement provides that the Company
will promptly take all actions necessary to cause such Purchaser designees to be
so elected, including, upon request by Purchaser, increasing the size of the
Board of Directors of the Company or, if necessary, using its best efforts to
seek the resignations of one or more existing directors (except that there must
be no fewer than two Continuing Directors (as defined below) until the time the
Merger becomes effective (the "EFFECTIVE TIME")). Following the election or
appointment of Purchaser designees and prior to the Effective Time if any of the
directors of the Company then in office is a director of the Company on the date
of the Merger Agreement (the "CONTINUING DIRECTOR"), any amendment or
termination of the Merger Agreement which requires action by the Company, any
extension of time for the performance of any of the obligations or other acts of
Parent or Purchaser under the Merger Agreement and any exercise or waiver of any
of the provisions of the Merger Agreement providing rights or remedies to the
Company, will require the affirmative vote of a majority of the Continuing
Directors.

     The Merger.  The Merger Agreement provides that, after the completion of
the Offer and the satisfaction or waiver of certain conditions, Purchaser will
be merged with and into the Company and the

                                       20
<PAGE>   23

Company will be the surviving corporation, unless Parent elects, in its sole
discretion, to cause the Company to merge into Purchaser with Purchaser
continuing as the surviving corporation. On the effective date of the Merger,
each outstanding Share (other than Shares owned by Parent, Purchaser or any
subsidiary or affiliate of Parent, Purchaser or the Company, or held in the
treasury of the Company, or held by shareholders who properly exercise
dissenters' rights under the DGCL, if any) will by virtue of the Merger and
without action by the holder thereof be cancelled and converted into the right
to receive an amount in cash equal to the Merger Consideration.

     The Company has agreed pursuant to the Merger Agreement that, if required
by applicable law in order to consummate the Merger, it will (i) convene and
hold a special meeting of its shareholders as soon as practicable following the
consummation of the Offer for the purpose of approving and adopting the
agreement of merger (within the meaning of Section 251 of the DGCL) contained in
the Merger Agreement; (ii) prepare and file with the Commission a preliminary
proxy statement relating to the Merger Agreement, and (A) obtain and furnish the
information required to be included by the Commission in the Proxy Statement (as
defined herein) and, after consultation with Parent, respond as soon as
practicable to any comments made by the Commission with respect to the
preliminary proxy statement and to cause a definitive proxy statement (the
"PROXY STATEMENT") to be mailed to its shareholders and (B) use its best efforts
to obtain the necessary approval of the Merger by its shareholders; and (iii)
include in the Proxy Statement the recommendation of the Company Board of
Directors that shareholders of the Company vote in favor of the adoption of the
agreement of merger set forth in the Merger Agreement. Each of Parent and
Purchaser has agreed in the Merger Agreement that, at the Special Meeting, it
will vote all of the Shares acquired by it pursuant to the Offer or otherwise
owned or acquired by Parent or Purchaser or any of their affiliates in favor of
the approval of the Merger.

     The Merger Agreement further provides that, notwithstanding the foregoing,
if Purchaser or any other direct or indirect Subsidiary of Parent holds at least
90 percent of the outstanding shares of each class of capital stock of the
Company, they will take all necessary and appropriate action to cause the Merger
to become effective as soon as practicable after the consummation of the Offer
without a meeting of the stockholders of the Company, in accordance with Section
253 of the DGCL.

     Charter, Bylaws, Directors and Officers.  The Certificate of Incorporation
and By-Laws of Purchaser in effect immediately prior to the Effective Time will
be the Certificate of Incorporation and By-Laws of the surviving corporation
until amended, subject to the provisions of the Merger Agreement which provide
that all rights to indemnification now existing in favor of directors and
officers of the Company and its Subsidiaries as provided in their respective
charters or by-laws shall survive the Merger and continue in full force and
effect for a period of not less than the statute of limitations applicable to
such matters.

     The directors of Purchaser immediately prior to the Effective Time will be
the initial directors of the surviving corporation, and the officers of the
Company immediately prior to the Effective Time will be the initial officers of
the surviving corporation.

     Conversion of Shares.  Each Share issued and outstanding immediately prior
to the Effective Time (other than (i) any Shares held by Parent, Purchaser, any
Subsidiary or affiliate of Parent, Purchaser or the Company or held in the
treasury of the Company, all of which will be cancelled without any
consideration being exchanged therefor and (ii) dissenting shares) will, by
virtue of the Merger and without any action on the part of the holder thereof,
be converted at the Effective Time into the right to receive in cash an amount
per Share (subject to any applicable withholding tax) equal to the Merger
Consideration, without interest, upon surrender of the certificate representing
such Share. At the Effective Time, each Existing Stock Option (as defined below)
will be converted into the right to receive the Option Consideration (as defined
below). At the Effective Time, each share of common stock of Purchaser, no par
value, issued and outstanding immediately prior to the Effective Time will, by
virtue of the Merger and without any action on the part of the holder thereof,
be converted into and become one share of common stock of the surviving
corporation.

     The Merger Agreement provides that each option or right to acquire Shares
(the "EXISTING STOCK OPTIONS") granted under any stock option, or similar plan
of the Company or under any agreement to which the Company or any Subsidiary is
a party (the "STOCK OPTION PLANS") which is outstanding on the date that

                                       21
<PAGE>   24

the amendment to the Schedule TO reporting the initial acceptance by Purchaser
of the Shares tendered in the Offer is filed with the Commission (the
"ACCEPTANCE DATE"), whether or not then exercisable or vested, will by virtue of
the Merger and without any action on the part of the Company or the holder
thereof, be converted into and will become a right to receive an amount in cash,
without interest, with respect to each Share subject thereto equal to the
excess, if any, of the Merger Consideration over the per share exercise or
purchase price of such Existing Stock Option. On the Acceptance Date, each
holder of an Existing Stock Option will be entitled to receive, on the
Acceptance Date, in full satisfaction of such Existing Stock Option, an amount
in cash without interest in respect thereof equal to the product of (i) the
excess, if any, of the Merger Consideration over the per share exercise or
purchase price of such Existing Stock Option and (ii) the number of Shares
subject to such Existing Stock Option (such amount being hereinafter referred to
as the "OPTION CONSIDERATION"), and each Existing Stock Option will be canceled
on the Acceptance Date. This payment will be reduced by any income or employment
tax withholding required under the Code or any provision of state, local or
foreign tax law. To the extent that amounts are so withheld, such withheld
amounts will be treated for all purposes of the Merger Agreement as having been
paid to the holder of such Existing Stock Option. The Stock Option Plans will
terminate as of the Acceptance Date. All administrative and other rights and
authorities granted under any Stock Option Plan to the Company, the Board of
Directors of the Company or any Committee or designee thereof, will, following
the Acceptance Date, reside with the surviving corporation.

     Each incentive award or other right relating to, or the value of which is
based on the value of, Shares (an "EQUITY AWARD") that was granted under any
employee incentive or similar plan of the Company or under any agreement to
which the Company or any Subsidiary is a party (an "EQUITY PLAN"), and that is
outstanding on the Acceptance Date, whether or not then vested, will by virtue
of the Merger and without any action on the part of the Company or the holder
thereof, be converted into and will become a right to receive an amount in cash,
without interest, determined pursuant to the terms thereof based on the value of
a Share being equal to the Merger Consideration. Each holder of an Equity Award
will be entitled to receive on the Acceptance Date, in full satisfaction of such
Equity Award, an amount in cash without interest determined pursuant to the
terms thereof (for example, taking into account any exercise price or equivalent
thereof) based on the value of a Share being equal to the Merger Consideration.
Such payment will be reduced by any income or employment tax withholding
required under the Code or any provision of state, local or foreign tax law. To
the extent that amounts are so withheld, such withheld amounts will be treated
for all purposes of the Merger Agreement as having been paid to the holder of
such Equity Award. The Equity Plans will terminate as of the Acceptance Date and
any and all rights under any provisions in any other plan, program or
arrangement providing for the issuance or grant of any other interest in respect
of the capital stock of the Company or any Subsidiary thereof will be canceled
as of the Acceptance Date. All administrative and other rights and authorities
granted under any Equity Plan to the Company, the Board of Directors of the
Company or any Committee or designee thereof, will, following the Effective
Time, reside with the surviving corporation.

     Representations and Warranties.  In the Merger Agreement, the Company has
made customary representations and warranties to Parent and Purchaser with
respect to, among other matters, its organization and qualification,
capitalization, authority, consents and approvals, public filings, financial
statements, absence of any material adverse effect on the Company, information
to be included in the Offer Documents and the Proxy Statement, brokers, employee
benefit matters, litigation, tax matters, compliance with law, environmental
matters, intellectual property, real property, Y2K, material contracts, related
party transactions, inapplicability of state takeover statutes, the Rights
Agreement (as defined herein) and the vote required by the Company shareholders
to approve the Merger. Each of Parent and Purchaser has made customary
representations and warranties to the Company with respect to, among other
matters, its organization, qualifications, authority, information to be included
in the Offer Documents and the Proxy Statement, consents and approvals,
operations of Purchaser, the vote required by Parent's shareholders, brokers,
financial wherewithal and ownership of Company Shares. Parent also represented
that the affirmative vote of the holders of not less than a majority of the
outstanding shares of Parent which are present and voting at a meeting of
Parent's shareholders, is required to approve the consummation of the Offer and
the Merger by Parent and that such approval shall be obtained prior to the
initial expiration of the Offer. Carso, the holder of approximately 80 percent
of the voting capital stock of Parent, has agreed to cause a meeting of Parent's

                                       22
<PAGE>   25

shareholders to be convened prior to the initial Expiration Date and to vote all
its shares of Parent at such meeting in favor of the approval of the Offer and
the Merger.

     Covenants.  The Merger Agreement obligates the Company and its
Subsidiaries, from the date of the Merger Agreement until the earlier of the
Effective Time and the date on which the majority of the Company's directors are
designees of Parent or Purchaser or until the earlier termination of the Merger
Agreement, to conduct their operations only in the ordinary and usual course of
business and consistent with past practice and obligates the Company and its
Subsidiaries to use all reasonable efforts to preserve substantially intact
their business organizations, to keep available the services of their present
officers and employees and to preserve the present relationships with those
persons and entities having significant business relationships with the Company
and its Subsidiaries, except such as would not have any change in or effect on
the business of the Company that is or would be reasonably expected to be
materially adverse to any of the condition (financial or otherwise), business,
properties, assets, liabilities or results of operations of the Company and its
Subsidiaries taken as a whole, except as disclosed to Parent and Purchaser in
the disclosure letter to the Merger Agreement (a "MATERIAL ADVERSE EFFECT"). The
Company is obligated to promptly advise Parent and Purchaser in writing of any
material change in its or any of its Subsidiaries' condition (financial or
otherwise), properties, customer or supplier relationships, assets, liabilities
or results of operations. The Merger Agreement also contains specific
restrictive covenants as to certain activities of the Company prior to the date
on which the majority of the Company's directors are designees of Parent or
Purchaser, which provide that the Company will not (and will not permit any of
its Subsidiaries to) take certain actions without the prior written consent of
Parent, including, among other things and subject to certain exceptions, issuing
or selling its securities, redeeming or repurchasing securities, changing its
capital structure, making material acquisitions or dispositions, entering into
or amending material contracts, incurring indebtedness, settling litigation or
claims, increasing compensation or adopting new benefit plans, taking any action
that may result in the Offer conditions not being satisfied and permitting
certain other material events or transactions.

     No Solicitation.  In the Merger Agreement, the Company has agreed not to,
and to cause its Subsidiaries and its and their respective officers, directors,
employees, representatives, agents or affiliates thereof not to, directly or
indirectly, encourage, solicit, initiate or participate in any way in any
discussions or negotiations with, or provide any information to, or afford any
access to the properties, books or records of the Company or any of its
Subsidiaries to, or otherwise take any other action to assist or facilitate, any
person or group concerning any offer or proposal, or any indication of interest
in making an offer or proposal, which is structured to permit such person or
group to acquire beneficial ownership of 25 percent of the consolidated assets
of, or at least 25 percent of the equity interest in, the Company pursuant to a
merger, consolidation or other business combination, sale of shares of capital
stock, sale of assets, tender offer or exchange offer or similar transaction,
including any single or multi-step transaction or series of related
transactions, in each case other than the Offer and the Merger ("ACQUISITION
PROPOSAL").

     Notwithstanding the foregoing and subject to the Company notifying Parent
and Purchaser to that effect and to the prior execution by such Person or group
of a confidentiality agreement substantially identical to the confidentiality
provisions contained in the confidentiality agreement dated January 23, 2000
between the Company and Purchaser, the Company may furnish information to or
enter into discussions or negotiations with any Person or entity that has made
an unsolicited written bona fide Acquisition Proposal in respect of which the
Board of Directors of the Company has reasonably determined in good faith, after
receiving the advice of its outside counsel and independent financial advisors
(A) that the Person or entity making such inquiry ("POTENTIAL ACQUIROR") has the
financial wherewithal to consummate such Acquisition Proposal, (B) that such
Acquisition Proposal would, if consummated, result in a transaction that is more
favorable to the Company's shareholders (other than Parent and its affiliates)
than the Offer and the Merger from a financial point of view and (C) that such
Acquisition Proposal is reasonably likely to be consummated (a "SUPERIOR
PROPOSAL"), if, and only to the extent that the Board of Directors of the
Company, after consultation with outside legal counsel to the Company,
determines in good faith that failure to do so would be inconsistent with the
fiduciary duty of the Board of Directors of the Company to the shareholders of
the Company under applicable law.

                                       23
<PAGE>   26

     The Merger Agreement also requires the Company to promptly (and in any
event within one business day) notify Parent and Purchaser, orally and in
writing, if any such information is requested or any such negotiations or
discussions are sought to be initiated and to promptly communicate to Parent and
Purchaser the identity of the Potential Acquiror and any other material terms of
such request, inquiry or Acquisition Proposal. If the Company (or any of its
Subsidiaries or its or their respective officers, directors, employees,
representatives, agents or affiliates) participates in discussions or
negotiations with, or provides information to, a Potential Acquiror, the Company
is obligated to keep Parent advised on a current basis of any developments with
respect thereto.

     The Merger Agreement provides that unless and until the Merger Agreement
has been terminated, the Company shall not approve or recommend or propose
publicly to approve or recommend any Acquisition Proposal, release any third
party from any confidentiality or standstill agreement to which the Company is a
party or fail to enforce to the fullest extent possible any such agreement in
order to facilitate any Acquisition Proposal, redeem the Rights or amend, or
take any other action with respect to, the Rights Agreement to facilitate any
Acquisition Proposal or enter into any letter of intent, agreement in principle,
acquisition agreement or other agreement to effect any Acquisition Proposal.

     Indemnification; Directors' and Officers' Insurance.  In the Merger
Agreement, Parent and Purchaser have agreed that all rights to indemnification
existing in favor of the present or former directors, officers and employees of
the Company or any of its Subsidiaries as provided in the Company's Certificate
of Incorporation or Bylaws, or the articles of organization, bylaws or similar
documents of any of the Company's Subsidiaries as in effect at the date of the
Merger Agreement with respect to matters occurring prior to the Effective Time
will survive the Merger and continue in full force and effect for a period of
not less than the statutes of limitations applicable to such matters. Parent
agrees to cause the surviving corporation to comply fully with these obligations
and may not amend, repeal or otherwise modify the Certificate of Incorporation
and By-Laws of the surviving corporation for six years after the Effective Time
in any manner that would adversely affect the rights of individuals who as of
the date of the Merger Agreement were directors, officers, employees,
fiduciaries, agents of the Company or otherwise entitled to indemnification
under the Certificate of Incorporation, By-Laws or indemnification agreements
(the "INDEMNIFIED PARTIES"). In addition, the Certificate of Incorporation of
the surviving corporation will include provisions providing for advancement of
expenses to such Indemnified Parties in accordance with the Company's
Certificate of Incorporation and in accordance with Section 145 of Delaware Law.

     Parent, Purchaser and the Company agree that the Company will, to the
fullest extent permitted under Delaware Law and regardless of whether the Merger
becomes effective, indemnify, defend and hold harmless, and after the Effective
Time, Purchaser will cause the surviving corporation, to the fullest extent
permitted under Delaware Law, to indemnify, defend and hold harmless, each
Indemnified Party against any costs or expenses (including reasonable attorneys'
fees), judgments, fines, losses, claims, damages, liabilities and amounts paid
in settlement in connection with any claim, action, suit, proceeding or
investigation, including without limitation liabilities arising out of the
transactions contemplated in the Merger Agreement, to the extent that they were
based on the fact that such Indemnified Party is or was a director, officer or
employee of the Company and arising out of actions or omissions or alleged
actions or omissions occurring at or prior to the Effective Time, and in the
event of any such claim, action, suit, proceeding or investigation (whether
arising before or after the Effective Time), (i) the Company or the surviving
corporation, as applicable, will pay the reasonable fees and expenses of counsel
selected by the Indemnified Parties, which counsel must be reasonably
satisfactory to the Company or the surviving corporation, promptly as statements
therefor are received and (ii) the Company and the surviving corporation will
cooperate in the defense of any such matter. However, neither the Company nor
the surviving corporation will (i) be liable for any settlement effected without
its written consent (which consent may not be unreasonably withheld) and (ii) be
obliged under these subparagraphs to pay the fees and disbursements of more than
one counsel for all Indemnified Parties in any single action except to the
extent that, in the opinion of counsel for the Indemnified Parties, two or more
of such Indemnified Parties have conflicting interests in the outcome of such
action.

     The Merger Agreement further provides that the surviving corporation will
cause to be maintained in effect for a period of six years after the Effective
Time, in respect of acts or omissions occurring prior to the

                                       24
<PAGE>   27

Effective Time (but only in respect thereof), policies of directors' and
officers' liability insurance covering the persons covered by the Company's
existing directors' and officers' liability insurance policies (at the date of
the Merger Agreement) and providing substantially similar coverage to such
existing policies. However, the surviving corporation will not be required in
order to maintain such directors' and officers' liability insurance policies to
pay an annual premium in excess of 200 percent of the aggregate annual amounts
paid by the Company at the date of the Merger Agreement to maintain the existing
policies; and provided further that, if equivalent coverage cannot be obtained,
or can be obtained only by paying an annual premium in excess of 200 percent of
such amount, the surviving corporation will only be required to obtain as much
coverage as can be obtained by paying an annual premium equal to 200 percent of
such amount.

     The indemnification and directors' and officers' insurance covenants
described above will survive the consummation of the Merger and are intended to
benefit, and will be enforceable by, any Person or entity entitled to be
indemnified hereunder (whether or not parties to the Merger Agreement).

     Employee Benefit Arrangements.  The Merger Agreement provides that except
as set forth below, the Company will, and will cause its Subsidiaries to, and
from and after the Effective Time, Parent will, and will cause the surviving
corporation to, honor, in accordance with their terms, all existing employment
and severance agreements between the Company or any of its Subsidiaries and any
officer, director or employee of the Company or any of its Subsidiaries to the
extent disclosed in the disclosure letter to the Merger Agreement, including the
right of the Company to make any payment to any officer, director or employee on
a date that is prior to the Effective Time pursuant to the terms of any such
employment or severance agreements, as are or may be amended in accordance with
the form of amendment attached as Annex A to the Merger Agreement. For example,
at any time prior to the Effective Time, the Company will honor the rights of
any officer, director or employee who, in anticipation of a change in control,
terminates his employment in an "AGREEMENT TERMINATION" as such term is defined
in the applicable employment and severance agreements disclosed to Parent and
Purchaser as they are or may be amended in accordance with the form of amendment
attached as Annex A to the Merger Agreement.

     The Merger Agreement also provides that the Company will take, or cause to
be taken, all action necessary, as promptly as reasonably practicable, to amend
any plan maintained by the Company or any of its Subsidiaries to eliminate, as
of the date of the signing of the Merger Agreement, all provisions for the
purchase of Shares directly from the Company or any of its Subsidiaries or
securities of any Subsidiary, other than pursuant to Existing Stock Options and
Equity Awards and other than the outstanding options for the purchase of
cozone.com common stock granted under the cozone.com Inc. Long Term Incentive
Plan as disclosed to Parent and Purchaser. The Company shall cause the Board of
Directors to exercise its authority under the CompUSA Inc. cozone.com Stock
Option Plan to terminate such plan and all options granted thereunder. The
parties to the Merger Agreement agree not to take any action to deprive any
employee or director of the Company of the benefits of the consideration payable
with respect to the Offer and the Merger with respect to Shares held by such
person on the Acceptance Date.

     As of the Effective Time, Parent will, and will cause the surviving
corporation to: (i) honor and satisfy all obligations and liabilities that have
accrued as of the Effective Time under the employee benefit plans that are in
effect as of the date of the Merger Agreement, and (ii) continue all such
employee benefit plans (other than, in the case of clauses (i) and (ii), any
employee benefit plan whose termination is required as provided in the Merger
Agreement or under which the value of any awards or benefit is paid in or based
on the equity securities of the Company or any of its Subsidiaries) until the
first anniversary of the Effective Time in accordance with their terms and
applicable law. Subject to the foregoing, the surviving corporation may amend or
terminate any of the employee benefit plans described above following the first
anniversary of the Effective Time in accordance with their respective terms and
applicable law.

     Conditions to the Consummation of the Merger.  Pursuant to the Merger
Agreement, the respective obligations of Parent, Purchaser and the Company to
consummate the Merger are subject to the satisfaction or waiver, where
permissible, before the Effective Time of the following conditions: (i) the
agreement of merger contained in the Merger Agreement shall have been adopted by
the affirmative vote of the stockholders of the Company required by applicable
law, (ii) all necessary waiting periods under the HSR Act

                                       25
<PAGE>   28

applicable to the Merger shall have expired or been terminated, (iii) the
consummation of the Merger is not prohibited, restricted or made illegal by any
statute, rule, regulation, executive order, judgment, decree or injunction of a
court or any Governmental Entity (provided that each party to use all reasonable
efforts to have such prohibition lifted) and (iv) Purchaser shall have accepted
for purchase and paid, or cause to be paid, for the Shares tendered pursuant to
the Offer; provided that this last condition will be deemed to have been
satisfied with respect to the obligation of Parent and Purchaser to effect the
Merger if Purchaser fails to accept for payment or pay for Shares pursuant to
the Offer in violation of the terms of the Offer or of the Merger Agreement.

     Termination.  The Merger Agreement provides that it may be terminated and
the Merger may be abandoned at any time prior to the Effective Time,
notwithstanding approval thereof by the stockholders of the Company (with any
termination by Parent also being an effective termination by Purchaser):

          (a) by the mutual written consent of the Company and Parent;

          (b) by Parent or the Company if any court of competent jurisdiction or
     other Governmental Entity shall have issued an order, decree or ruling
     (which order, decree or ruling the parties to the Merger Agreement shall
     use reasonable effort to lift), or taken any other action restraining,
     enjoining or otherwise prohibiting any of the transactions contemplated by
     the Merger Agreement and such order, decree, ruling or other action shall
     have become final and non-appealable;

          (c) by the Company if (i) Purchaser fails to commence the Offer within
     seven business days of the public announcement of the terms of the Merger
     Agreement, (ii) Purchaser has not accepted for payment and paid for Shares
     pursuant to the Offer in accordance with the terms of the Offer on or
     before May 31, 2000, (iii) Purchaser fails to purchase validly tendered
     Shares in violation of the terms of the Merger Agreement or (iv) Purchaser
     or Parent shall have breached any of the representations, warranties or
     covenants of the Merger Agreement, which breach has had or is reasonably
     likely to have a material adverse effect on the ability of Parent or
     Purchaser to consummate the transactions contemplated by the Merger
     Agreement;

          (d) by Parent if (A) due to an occurrence or circumstance which would
     result in a failure to satisfy any of the conditions of the Offer contained
     in clause (iii) of Section 14, Purchaser shall not have commenced the Offer
     within seven business days after the public announcement of the terms of
     the Merger Agreement, (B) due to an occurrence or circumstance which would
     result in a failure to satisfy any of the conditions of the Offer,
     Purchaser shall have either (1) terminated the Offer without purchasing any
     Shares pursuant to the Offer or (2) failed to accept for payment Shares
     pursuant to the Offer prior to May 31, 2000;

          (e) by the Company, prior to the purchase of Shares pursuant to the
     Offer, if (i) the Company has given Parent and Purchaser at least two
     business days advance notice of its intention to accept or recommend a
     Superior Proposal and of all of the material terms and conditions of such
     Superior Proposal, and (ii) in response to an unsolicited Acquisition
     Proposal, the Board of Directors of the Company determines, after
     consultation with and the receipt of the advice of its financial advisor
     and outside legal counsel, that such Acquisition Proposal is a Superior
     Proposal and that failure to terminate the Merger Agreement would be
     inconsistent with the fiduciary duties of the Board of Directors of the
     Company under applicable law; provided that such termination shall not be
     effective unless and until the Company shall have paid to Parent all of the
     Termination Fee; or

          (f) by Parent, prior to the purchase of Shares pursuant to the Offer,
     if the Company shall have taken or the Board of Directors shall have
     resolved to take any of the actions referred to in the second paragraph
     above under "No Solicitation," or if the Company shall have withdrawn or
     modified, or proposed publicly to withdraw or modify, in a manner adverse
     to Parent or Purchaser, its Board of Directors' approval or recommendation
     of the Offer or the Merger.

     Effect of Termination.  In the event that the Merger Agreement is
terminated in accordance with its terms and the Merger is abandoned, the Merger
Agreement will become void and have no effect, without any liability on the part
of any party or its directors, officers or stockholders, other than the
provisions relating to

                                       26
<PAGE>   29

the payment of certain fees and expenses, including the Termination Fee, which
shall survive any such termination; provided that no party would be relieved
from liability for any breach of the Merger Agreement.

     Fees and Expenses.  Except as provided below, whether or not the Merger is
consummated, all costs and expenses incurred in connection with the Offer, the
Merger Agreement and the transactions contemplated by the Merger Agreement will
be paid by the party incurring such expenses.

     In the event that the Merger Agreement is terminated pursuant to (1)
subparagraph (e) or (f) under "Termination" above or (2) subparagraphs (c)(ii)
or (d) under "Termination" and (in the case of this clause (2) only) such
termination was the result of the failure of either the Minimum Tender Condition
to be satisfied or the condition set forth in clause (iii)(f) of Section 14 to
be satisfied (provided, in the case of clause (iii)(f), such condition is not
satisfied due to a willful breach by the Company) and either (A) prior to such
termination an Acquisition Proposal (other than any Acquisition Proposal made by
or on behalf of, or encouraged, solicited or initiated in any respect by,
Parent, Purchaser or any of their respective affiliates or any of such persons'
associates) has been made or publicly announced or (B) within six months
thereafter an Acquisition Proposal has been consummated, then the Company shall
pay Parent a termination fee of $20 million (which will be deemed to include
reimbursement for all fees and expenses of Parent and Purchaser related to the
Offer, the Merger Agreement, the transactions contemplated in the Merger
Agreement and any related financing) (the "TERMINATION FEE"). If such amounts
become payable pursuant to clause (1) or (2)(A) of this paragraph, they shall be
payable simultaneously with such termination (in the case of a termination by
the Company) or within two business days thereafter (in the case of a
termination by Parent). If such amounts become payable pursuant to clause (2)(B)
of this paragraph, they will be payable simultaneously with completion of such
Acquisition Proposal. No Termination Fee will be payable as described in this
subparagraph if Parent or Purchaser shall be in material breach of its
obligations under the Merger Agreement.

     Amendment.  To the extent permitted by applicable law, the Merger Agreement
may be amended by action taken by or on behalf of the Boards of Directors of the
Company, Parent and Purchaser, subject in the case of the Company to the
approval of the Continuing Directors as described under "Directors" above, at
any time before or after adoption of the Merger Agreement by the shareholders of
the Company but, after any such shareholder approval, no amendment may be made
which decreases the Merger Consideration or which adversely affects the rights
of the Company's shareholders hereunder without the approval of the shareholders
of the Company. Any amendment to the Merger Agreement must be in writing.

     No appraisal rights are available in connection with the Offer. If the
Merger is consummated, however, shareholders of the Company who have not
tendered their Shares will have certain rights under the DGCL to dissent and
demand appraisal of, and to receive payment in cash of the fair value of, their
Shares. See Section 15.

     Executive Employment Agreements.  The named executive officers (as
described in the Company's most recent Commission filing) have each entered into
an Amendment to Employment Agreement (the "AMENDMENT") in the form attached to
the Merger Agreement. Under their employment agreements with the Company, the
named executive officers are entitled to certain payments under certain
circumstances as a result of the consummation of the Offer. The Amendment
provides that, in the event the respective executive is entitled to such
payments, the Company shall withhold twenty percent of such payment (the
"DEFERRED PAYMENT") and deposit an amount equal to the Deferred Payment into an
escrow account for the benefit of the executive. The Company will pay the
executive the Deferred Payment (plus earnings thereon) on the earlier to occur
of (i) the three-month anniversary of the date that the initial payment was made
to the executive, if the employee is employed by the Company at such time and
(ii) two (2) business days after the date on which the executive's employment
with the Company terminates for any reason other than by the Company for Cause
(as defined in the Amendment) or the executive's voluntary resignation. If
employment is terminated for cause or the executive voluntarily resigns prior to
such three-month anniversary, the Deferred Payment will be forfeited.

                                       27
<PAGE>   30

12. RIGHTS AGREEMENT

     Set forth below is a summary description of the Rights, as contained in the
Company's Registration Statement on Form 8-A, dated April 29, 1994, relating to
the Rights.

     On April 29, 1994, the Board of Directors of the Company, declared a
dividend of one Right for each outstanding share of Common Stock. The dividend
was payable to holders of record of Common Stock at the close of business on May
9, 1994. Each Right entitles the registered holder to purchase from the Company
one ten-thousandth (1/10,000) of a share of Series A Junior Participating
Preferred Stock (the "SERIES A PREFERRED STOCK") at a Purchase Price of $120.
The terms and conditions of the Rights are contained in a Rights Agreement
between the Company and American Stock Transfer & Trust Company (formerly Bank
One, Texas, N.A.), as Rights Agent.

     AS DISCUSSED BELOW, INITIALLY THE RIGHTS WILL NOT BE EXERCISABLE,
CERTIFICATES FOR THE RIGHTS WILL NOT BE ISSUED AND THE RIGHTS WILL AUTOMATICALLY
TRADE WITH THE COMMON STOCK.

     Until the close of business on the Distribution Date, that will occur on
the earlier of (i) the tenth day following the public announcement that a person
or group of affiliated or associated persons ("ACQUIRING PERSON") other than the
Company, any subsidiary of the Company or any employee benefit plan or employee
stock plan of the Company or of any subsidiary of the Company (each an "EXEMPT
PERSON") has acquired, or obtained the right to acquire, beneficial ownership of
20 percent or more of the outstanding Common Stock (the "STOCK ACQUISITION
DATE") or (ii) the tenth business date following the commencement by any person
(other than an Exempt Person) of, or the announcement of the intention to
commence, a tender or exchange offer that would result in the ownership of 20
percent or more of the outstanding Common Stock (the earlier of such dates in
clauses (i) and (ii) being called the "DISTRIBUTION DATE") the Rights will be
evidenced, with respect to any of the Common Stock certificates outstanding as
of May 9, 1994, by such Common Stock certificate, together with a copy of this
summary of Rights. The Rights Agreement provides that, until the Distribution
Date (or the earlier redemption or expiration of the Rights), the Rights will be
represented by and transferred with, and only with, the Common Stock. Until the
Distribution Date (or the earlier redemption or expiration of the Rights), new
Common Stock certificates issued after the Record Date upon transfer or new
issuance of shares of Common Stock will contain a legend incorporating the
Rights Agreement by reference. Until the Distribution Date (or the earlier
redemption or expiration of the Rights) the surrender for transfer of any of the
Company's Common Stock certificates, with or without such legend or a copy of
this Summary of Rights, will also constitute the surrender for transfer of the
Rights associated with the Common Stock evidenced by such certificates. As soon
as practicable following the Distribution Date, separate Rights Certificates
will be mailed to holders of record of Common Stock at the close of business on
the Distribution Date, and thereafter the Right Certificates alone will evidence
the Rights, and the Rights will be transferable separate and apart from the
Common Stock.

     The Rights are not exercisable until the Distribution Date. The Rights will
expire at the close of business on April 28, 2004, unless redeemed or exchanged
earlier as described below.

     The Series A Preferred Stock will not be redeemable and, unless otherwise
provided in connection with the creation of a subsequent series of preferred
stock, will be subordinate to all other series of the Company's preferred stock.
Each share of Series A Preferred Stock will represent the right to receive,
when, as and if declared, a quarterly dividend at an annual rate equal to the
greater of $1.00 per share or 10,000 times the quarterly per share cash
dividends declared on the Company's Common Stock during the immediately
preceding fiscal year. In addition, each share of Series A Preferred Stock will
represent the right to receive 10,000 times any noncash dividends (other than
dividends payable in Common Stock) declared on the Common Stock, in like kind.
In the event of the liquidation, dissolution or winding up of the Company, each
share of Series A Preferred Stock will represent the right to receive a
liquidation payment in an amount equal to the greater of $1.00 per share or
10,000 times the liquidation payment made per share of Common Stock. Each share
of Series A Preferred Stock will have 10,000 votes, voting together with the
Common Stock. In the event of any merger, consolidation or other transaction in
which common shares are exchanged, each share of Series A Preferred Stock will
be entitled to receive 10,000 times the amount received per share of Common

                                       28
<PAGE>   31

Stock. The rights of the Series A Preferred Stock as to dividends, liquidation,
voting rights and merger participation are protected by anti-dilution
provisions.

     The Purchase Price payable and the number of shares of Series A Preferred
Stock or other securities or property issuable upon exercise of the Rights are
subject to adjustment from time to time to prevent dilution (i) in the event of
a stock dividend on, or a subdivision, combination or reclassification of, the
Series A Preferred Stock, (ii) upon the grant to holders of the Series A
Preferred Stock of certain rights or warrants to subscribe for Series A
Preferred Stock or convertible securities at less than the current market price
of the Series A Preferred Stock or (iii) upon the distribution to holders of the
Series A Preferred Stock of evidences of indebtedness or assets (excluding
regular cash dividends and dividends payable in Series A Preferred Stock) or of
subscription rights or warrants.

     If any Person (other than an Exempt Person) becomes the beneficial owner of
20 percent or more of the then outstanding shares of Common Stock, each holder
of a Right, other than the Acquiring Person, will have the right to receive,
upon payment of the Purchase Price, in lieu of Series A Preferred Stock, a
number of shares of Common Stock having a market value equal to twice the
Purchase Price. In the event that insufficient shares of Common Stock are
available for the exercise in full of the Rights, the Company shall, in lieu of
issuing shares of Common Stock upon exercise of Rights, to the extent permitted
by applicable law and any material agreements then in effect to which the
Company is a party, issue shares of Series A Preferred Stock, cash, property or
other securities of the Company (which may be accompanied by a reduction in the
Purchase Price), in proportions determined by the Company, so that the aggregate
value of such cash, property or other securities received is equal to twice the
Purchase Price. After the acquisition of shares of Common Stock by an Acquiring
Person as described in this paragraph, Rights that are (or, under certain
circumstances, Rights that were) beneficially owned by an Acquiring Person will
be void.

     The Board of Directors may, at its option, at any time after a person
becomes an Acquiring Person, authorize the Company to exchange all or part of
the then outstanding and exercisable Rights for shares of Common Stock or Series
A Preferred Stock at an exchange ratio of one share of Common Stock or one ten-
thousandth of a share of Series A Preferred Stock per Right, provided that the
Board of Directors may not effect such exchange after the time that any Person
(other than an Exempt Person) becomes the beneficial owner of 50 percent or more
of the Common Stock then outstanding. In the event that insufficient shares of
Common Stock are available for such exchange, the Board of Directors may
substitute, in lieu thereof, shares of Series A Preferred Stock or equivalent
preferred stock of equal value.

     Unless the Rights are earlier redeemed, if, after the Stock Acquisition
Date, the Company is acquired in a merger or other business combination (in
which any shares of the Common Stock are changed into or exchanged for other
securities or assets) or more than 50 percent of the assets or earning power of
the Company and its subsidiaries (taken as a whole) is sold or transferred in
one or more transactions, other than a transfer to a lender (or an assignee of a
lender) of the Company pursuant to material agreements then in effect to which
the Company is a party (each a "SECTION 13 EVENT"), the Rights Agreement
provides that proper provision shall be made so that each holder of record of a
Right will from and after that time have the right to receive, upon payment of
the Purchase Price, that number of shares of common stock of the acquiring
company which has a current market price at the time of such transaction equal
to twice the Purchase Price (the "FLIP OVER PROVISION").

     Interests in fractions of shares of Series A Preferred Stock may, at the
election of the Company, be evidenced by depository receipts. The Company may
also issue cash in lieu of fractional shares of Series A Preferred Stock that
are not integral multiples of one ten-thousandth of a share.

     At any time until a person becomes an Acquiring Person, the Board of
Directors may cause the Company to redeem the Rights in whole, but not in part,
at a price of $.001 per Right, subject to adjustment. Immediately upon the
effective time of the redemption authorized by the Board of Directors the right
to exercise the Rights will terminate, and the holders of Rights will only be
entitled to receive the redemption price without any interest thereon.

                                       29
<PAGE>   32

     As long as the Rights are redeemable, the Company may, except with respect
to the redemption price or the number of shares of Series A Preferred Stock for
which a Right is exercisable, amend the Rights in any manner. At any time when
the Rights are not redeemable, the Company may amend the Rights in any manner
that does not adversely affect the interests of holders of the Rights as such.

     Until a Right is exercised, the holder, as such, will have no rights as a
stockholder of the Company, including without limitation the right to vote or to
receive dividends.

     In connection with the Company entering into the Merger Agreement, the
Company has amended the Rights Agreement such that any and all provisions in the
Rights Agreement which prohibit the execution of the Merger Agreement, the
announcement or making of the Offer, the acquisition of the Shares pursuant to
the Offer, and the consummation of the Merger, or any of the transactions
contemplated by the Merger Agreement were waived and will not cause, among other
things, Parent or Purchaser to be deemed to be an Acquiring Person, or a
Distribution Date or Section 13 Event to be deemed to have occurred pursuant to
the Rights Agreement.

13. SOURCE AND AMOUNT OF FUNDS

     The Offer is not conditioned upon any financing arrangements.

     Parent and Purchaser estimate that the total amount of funds required to
purchase all of the outstanding Shares that Parent or its affiliates do not own
pursuant to the Offer and the Merger and to pay related fees and expenses will
be approximately $840 million. Purchaser expects to obtain approximately $480
million of such amount from Parent (through a capital contribution or advances).
Parent currently anticipates funding such capital contributions or advances
through a combination of cash on hand and other internally generated funds.
Parent may consider funding or refinancing all or a portion of such amount
through the arrangement of third party borrowings by Purchaser. However, no
final decision in this regard has been taken and no such arrangements are
currently existing or planned.

     Parent and Purchaser will obtain the remainder of such required funds from
one or more other investors in Purchaser (also through capital contributions or
combinations of capital contributions and advances) who will, as a result,
become minority shareholders of Purchaser, although it is Parent's intention to
own at all times at least a majority of the entire equity interest and voting
power in Purchaser.

     One of such other investors will be Telefonos de Mexico, S.A. de C.V.
("TELMEX"). Telmex has delivered a letter, dated January 23, 1999, to Parent
confirming its commitment to make, at Parent's request, a capital contribution
of up to $520 million to Purchaser for the purpose of acquiring Shares pursuant
to the Merger Agreement. A copy of this letter is included as an exhibit to the
Schedule TO. As a result of such capital contribution Telmex may own, depending
on the participation of other investors and other factors, as much as 49 percent
of the entire equity interest and voting power in Purchaser. Telmex anticipates
funding any capital contributions to Purchaser through a combination of cash on
hand and other internally generated funds.

     Telmex is a corporation organized under the laws of the United Mexican
States. It owns and operates the largest telecommunications system in Mexico and
is currently the leading provider of local, long-distance and cellular telephone
services throughout Mexico. Telmex also provides other telecommunications and
telecommunications-related services such as directory services, data
transmission, internet access, paging service and interconnection services to
other carriers. The principal executive offices of Telmex are located at Parque
Via 190, Colonia Cuauhtemoc, 06599 Mexico, D.F., and its business telephone
number is 011-525-222-1212. Telmex is a "foreign private issuer" certain of
whose shares are listed on the NYSE and which is subject to the informational
reporting requirements of the Exchange Act. Through their indirect ownership or
control of its voting shares, the Slim Family may be deemed to be ultimately in
control of Telmex. Other information regarding Telmex and its directors and
executive officers is included in the Schedule TO. Inasmuch as Telmex is
expected to become a substantial minority investor in Purchaser, information
regarding Telmex has been included in this Offer to Purchase and in the Schedule
TO that would be required to be included if Telmex were a "bidder" in connection
with the Offer for purposes of applicable rules under the Exchange Act.

                                       30
<PAGE>   33

However, Parent, Purchaser and Telmex disclaim that Telmex is a "bidder" and the
inclusion of such information should not be taken as an admission to that
effect.

     The investment of Parent, together with the funds from the Telmex
investment, will be sufficient to acquire all Shares which are the subject of
the Offer and the Merger and pay related expenses. However, Parent intends to
include as additional minority equity investors in Purchaser certain persons
whose involvement as strategic business partners it believes can benefit the
Company following the Merger. In particular, Parent has held discussions with
Prodigy Communications Corp., Microsoft Corporation and SBC Communications Inc.
regarding possible commercial agreements as well as, in the case of Microsoft
and SBC, minority investments in Purchaser. The minority investment of each of
these potential investors is not expected to exceed 5 percent of Purchaser's
capital stock. Any such investments would correspondingly reduce the equity
interest of Telmex. No definitive agreements with any of such persons with
respect to any such investments have been reached.

14. CERTAIN CONDITIONS OF THE OFFER

     Notwithstanding any other provision of the Offer, Purchaser shall not be
required to accept for payment, purchase or pay for any Shares tendered in
connection with the Offer and may terminate or, subject to the terms of the
Merger Agreement, amend the Offer as to Shares not then paid for, if (i) there
shall not be validly tendered and not properly withdrawn prior to the Expiration
Date that number of Shares which, together with any Shares beneficially owned by
Purchaser or Parent or any of their respective affiliates, represents at least
two-thirds of the total number of outstanding Shares on a fully diluted basis on
the date of purchase, (ii) any applicable waiting period under the HSR Act shall
not have expired or been terminated prior to the Expiration Date, or (iii) at
any time on or after the date of the Merger Agreement and prior to the time of
payment for any Shares, any of the following conditions exist:

          (a) there shall have been any action taken, or any statute, rule,
     regulation, legislation, interpretation, judgment, order or injunction,
     proposed, sought, promulgated, enacted, entered, enforced, issued, amended
     or deemed applicable to Parent, Purchaser, the Company, any other affiliate
     of Parent or the Company, the Offer or the Merger, that would or is
     reasonably likely, directly or indirectly, to (1) make the acceptance for
     payment of, or payment for or purchase of all or a substantial number of
     the Shares pursuant to the Offer illegal, or otherwise restrict or prohibit
     the consummation of the Offer or the Merger, (2) result in a significant
     delay in or restrict the ability of Purchaser to accept for payment, pay
     for or purchase all or a substantial number of the Shares pursuant to the
     Offer or to effect the Merger, (3) render Purchaser unable to accept for
     payment or pay for or purchase all or a substantial number of the Shares
     pursuant to the Offer, (4) impose material limitations on the ability of
     Parent, Purchaser or any of their respective Subsidiaries (as defined in
     the Merger Agreement) or affiliates to acquire or hold, transfer or dispose
     of, or effectively to exercise all rights of ownership of, all or a
     substantial number of the Shares including the right to vote the Shares
     purchased by it pursuant to the Offer on an equal basis with all other
     Shares on all matters properly presented to the stockholders of the
     Company, (5) require the divestiture by Parent, Purchaser or any of their
     respective Subsidiaries or affiliates of any Shares, or require Purchaser,
     Parent, the Company, or any of their respective Subsidiaries or affiliates
     to dispose of or hold separate all or any material portion of their
     respective businesses, assets or properties or impose any material
     limitations on the ability of any of such entities to conduct their
     respective businesses or own such assets, properties or Shares or on the
     ability of Parent or Purchaser to conduct the business of the Company and
     its Subsidiaries and own the assets and properties of the Company and its
     Subsidiaries, (6) impose any material limitations on the ability of Parent,
     Purchaser or any of their respective Subsidiaries or affiliates effectively
     to control the business or operations of the Company, Parent, Purchaser or
     any of their respective Subsidiaries or affiliates, or (7) otherwise
     materially adversely affect Parent, Purchaser, the Company or any of their
     respective Subsidiaries or affiliates, or their business, assets,
     liabilities, condition (financial or otherwise) or results of operations,
     or the value of the Shares;

          (b) there shall have been instituted or pending any action, proceeding
     or counterclaim by any Governmental Entity challenging the making of the
     Offer or the acquisition by Purchaser of the Shares

                                       31
<PAGE>   34

     pursuant to the Offer or the consummation of the Merger, or seeking to,
     directly or indirectly, result in any of the consequences referred to in
     clauses (1) through (7) of paragraph (a) above;

          (c) there shall have occurred (1) any general suspension of, or
     limitation on trading in securities on any national securities exchange or
     in the over-the-counter market in the United States (other than any
     suspension or limitation on trading in any particular security as a result
     of a computerized trading limit or any intraday suspension due to "circuit
     breakers"), (2) the declaration of any banking moratorium or any suspension
     of payments in respect of banks or any limitation (whether or not
     mandatory) on the extension of credit by lending institutions in the United
     States, (3) a decline at any time through February 29, 2000 of more than
     2250 points in the Dow Jones Index measured from the closing price on the
     trading day immediately preceding the date of the Merger Agreement, or (4)
     in the case of any of the foregoing (other than clause (3)) existing at the
     time of the execution of the Merger Agreement, a material acceleration or
     worsening thereof;

          (d) any Person or "group" (as such term is used in Section 13(d)(3) of
     the Exchange Act) other than Parent, Purchaser or any of their respective
     affiliates shall have become the beneficial owner (as that term is used in
     Rule 13d-3 under the Exchange Act) of more than 20 percent of the
     outstanding Shares;

          (e) there shall have occurred any change, condition, event or
     development that, individually or in the aggregate, has had or is
     reasonably likely to have, a Material Adverse Effect with respect to the
     Company;

          (f) the Company shall have breached or failed to comply in any
     material respect with any of its material obligations, covenants, or
     agreements under the Merger Agreement, or any representation or warranty of
     the Company contained in the Merger Agreement that is qualified by
     reference to a Material Adverse Effect or the representation in Section
     4.09(f) of the Merger Agreement shall not be true and correct, or any other
     such representation or warranty shall not be true and correct in any
     respect that (when taken together with all such other representations and
     warranties not true and correct) has had or would reasonably be likely to
     have a Material Adverse Effect, in each case either as of when made or at
     and as of any time thereafter; or

          (g) the Merger Agreement shall have been terminated pursuant to its
     terms or shall have been amended pursuant to its terms to provide for such
     termination or amendment of the Offer;

which, in the good faith judgment of Parent or Purchaser, in any case, and
regardless of the circumstances (including any action or inaction by Parent or
Purchaser or any of their affiliates) giving rise to any such condition, makes
it inadvisable to proceed with the Offer or with acceptance for payment or
payment for Shares.

     The foregoing conditions are for the sole benefit of Parent and Purchaser
and may be asserted regardless of the circumstances (including any action or
inaction by Parent or Purchaser or any of their affiliates giving rise to any
such condition) or waived by Parent or Purchaser in whole or in part at any time
or from time to time in its discretion subject to the terms and conditions of
the Merger Agreement (provided, however, that the Minimum Tender Condition may
not be waived without the Company's consent). The failure of Parent or Purchaser
at any time to exercise any of the foregoing rights shall not be deemed a waiver
of any such right and each such right shall be deemed an ongoing right which may
be asserted at any time and from time to time. Any determination by Parent or
Purchaser concerning the events described above will be final and binding on all
parties.

15. CERTAIN LEGAL MATTERS

     General.  Except as otherwise disclosed herein, Parent and Purchaser are
not aware of any licenses or other regulatory permits which appear to be
material to the business of the Company and which might be adversely affected by
the acquisition of Shares by Purchaser pursuant to the Offer or of any approval
or other action by any governmental, administrative or regulatory agency or
authority which would be required for the acquisition or ownership of Shares by
Purchaser pursuant to the Offer. Should any such approval or other action be
required, it is currently contemplated that such approval or action would be
sought or taken. There

                                       32
<PAGE>   35

can be no assurance that any such approval or action, if needed, would be
obtained or, if obtained, that it will be obtained without substantial
conditions or that adverse consequences might not result to the Company's or
Parent's business or that certain parts of the Company's or Parent's business
might not have to be disposed of in the event that such approvals were not
obtained or such other actions were not taken. Purchaser's obligation under the
Offer to accept for payment and pay for Shares is subject to certain conditions.
See Section 14.

     Antitrust Compliance.  Under the provisions of the HSR Act applicable to
the Offer, the purchase of Shares under the Offer may be consummated following
the expiration or earlier termination of a 15-calendar-day waiting period
following the filing by Carso of a Notification and Report Form with respect to
the Offer, unless Carso receives a request for additional information or
documentary material from the Antitrust Division of the U.S. Department of
Justice (the "ANTITRUST DIVISION") or the U.S. Federal Trade Commission (the
"FTC"). Carso expects to make its filing with the Antitrust Division and the FTC
on or about February 1, 2000, and the waiting period is expected to terminate
within 15 calendar days thereafter. If, within the initial 15-day waiting
period, either the Antitrust Division or the FTC requests additional information
or documentary material from Carso, the waiting period will be extended and
would expire at 11:59 p.m., New York City time, on the tenth calendar day after
the date of substantial compliance by Carso with such request. Only one
extension of the waiting period pursuant to a request for additional information
is authorized by the HSR Act. Thereafter, such waiting period may be extended
only by court order or with the consent of Carso. If the acquisition of Shares
is delayed pursuant to a request by the FTC or the Antitrust Division for
additional information or documentary material pursuant to the HSR Act, the
Offer may, at the sole discretion of Carso, be extended and, in any event, the
purchase of and any payment for Shares will be deferred until the Expiration
Date. Unless the Offer is extended, any extension of the waiting period may not
give rise to any additional withdrawal rights. See Section 4.

     In practice, complying with a request for additional information or
documentary material can take a significant amount of time. In addition, if the
Antitrust Division or the FTC raises substantive issues in connection with a
proposed transaction, the parties frequently engage in negotiations with the
relevant governmental agency concerning possible means of addressing those
issues and may agree to delay consummation of the transaction while such
negotiations continue.

     The FTC and the Antitrust Division frequently scrutinize the legality under
the antitrust laws of transactions such as Purchaser's proposed acquisition of
the Company. At any time before or after Purchaser's purchase of Shares pursuant
to the Offer, the Antitrust Division or the FTC could take such action under the
antitrust laws as it deems necessary or desirable in the public interest,
including seeking to enjoin the purchase of Shares pursuant to the Offer or the
Merger or seeking the divestiture of Shares acquired by Purchaser or the
divestiture of substantial assets of Carso or its Subsidiaries, or of the
Company or its Subsidiaries. Private parties may also bring legal action under
the antitrust laws under certain circumstances. If any such action by the FTC,
the Antitrust Division or any other person should be threatened or commenced,
Carso believes that consummation of the Offer would not violate any antitrust
laws; there can be no assurance, however, that a challenge to the Offer on
antitrust grounds will not be made or, if a challenge is made, what the result
will be.

     State Take-over Laws.  A number of states (including Delaware where the
Company is incorporated) have adopted takeover laws and regulations which
purport, to varying degrees, to be applicable to attempts to acquire securities
of corporations which are incorporated in such states or which have substantial
assets, stockholders, principal executive offices or principal places of
business therein. To the extent that certain provisions of certain of these
state takeover statutes purport to apply to the Offer or the Merger, Purchaser
believes that such laws conflict with federal law and constitute an
unconstitutional burden on interstate commerce.

     Section 203 of the DGCL prevents certain "business combinations" with an
"interested stockholder" (generally, any person who owns or has the right to
acquire 15 percent or more of a corporation's outstanding voting stock) for a
period of three years following the time such person became an interested
stockholder, unless, among other things, prior to the time the interested
stockholder became such, the board of directors of the corporation approved
either the business combination or the transaction in which the interested
stockholder became such. The Board of Directors of the Company has irrevocably
taken all necessary steps to

                                       33
<PAGE>   36

render the restrictions of Section 203 of the DGCL inapplicable to the Merger,
the Offer and the related transactions.

     Purchaser has not attempted to comply with any state takeover statutes in
connection with the Offer or the Merger. Purchaser reserves the right to
challenge the validity or applicability of any state law allegedly applicable to
the Offer or the Merger, and nothing in this Offer to Purchase nor any action
taken in connection herewith is intended as a waiver of that right. In the event
that it is asserted that one or more takeover statutes apply to the Offer or the
Merger, and it is not determined by an appropriate court that such statute or
statutes do not apply or are invalid as applied to the Offer or the Merger, as
applicable, Purchaser may be required to file certain documents with, or receive
approvals from, the relevant state authorities, and Purchaser might be unable to
accept for payment or purchase Shares tendered pursuant to the Offer or be
delayed in continuing or consummating the Offer. In such case, Purchaser may not
be obligated to accept for purchase, or pay for, any Shares tendered. See
Section 14.

     Appraisal Rights.  No appraisal rights are available in connection with the
Offer. If the Merger is consummated, however, shareholders of the Company who
have not tendered their Shares will have certain rights under the DGCL to
dissent and demand appraisal of, and to receive payment in cash of the fair
value of, their Shares. Under Section 262 of the DGCL, dissenting shareholders
of the Company who comply with the applicable statutory procedures will be
entitled to a judicial determination of the fair value of their Shares
(exclusive of any element of value arising from the accomplishment or
expectation of the Merger) and to receive payment of such fair value in cash,
together with a fair rate of interest thereon, if any. Any such judicial
determination of the fair value of the Shares could be based upon factors other
than, or in addition to, the price per Share to be paid in the Merger or the
market value of the Shares. The value so determined could be more or less than
the price per Share to be paid in the Merger.

     THE FOREGOING SUMMARY OF THE RIGHTS OF DISSENTING SHAREHOLDERS UNDER THE
DGCL DOES NOT PURPORT TO BE A COMPLETE STATEMENT OF THE PROCEDURES TO BE
FOLLOWED BY SHAREHOLDERS DESIRING TO EXERCISE ANY APPRAISAL RIGHTS UNDER THE
DGCL. THE PRESERVATION AND EXERCISE OF APPRAISAL RIGHTS REQUIRE STRICT ADHERENCE
TO THE APPLICABLE PROVISIONS OF THE DGCL.

     "Going Private" Transactions.  Rule 13e-3 under the Exchange Act is
applicable to certain "going private" transactions and may under certain
circumstances be applicable to the Merger. However, Rule 13e-3 will be
inapplicable if (i) the Shares are deregistered under the Exchange Act prior to
the Merger or another business combination or (ii) the Merger or other business
combination is consummated within one year after the purchase of the Shares
pursuant to the Offer and the amount paid per Share in the Merger or other
business combination is at least equal to the amount paid per Share in the
Offer. Neither Parent nor Purchaser believes that Rule 13e-3 will be applicable
to the Merger.

     Legal Proceedings.

     A complaint seeking class action status entitled Daniel Exner, CompUSA Inc.
et al, Cause No. CC-00-00921-C was filed in the County Court At Law of Dallas
County, Texas on January 24, 2000 by Daniel Exner, a shareholder of the Company,
in connection with the proposed Merger, against the Company and Messrs. Barry L.
Williams, Mortin E. Handel, Lawrence Mittman, Giles H. Bateman, Leonard L.
Berry, James P. Halpin, Warren D. Feldberg and Kevin J. Roche (each a director
and/or officer of the Company). Plaintiff alleges that the individual defendants
breached their fiduciary duties of loyalty and care to the Company and its
shareholders by, among other things, entering into the Merger Agreement at an
unfair price, failing to maximize shareholder value, and benefitting themselves
at the expense of shareholders. The complaint seeks a declaration that the
individual defendants breached their duties of loyalty and care, an injunction
against the Merger and unspecified monetary damages, costs and fees, and other
relief.

16. FEES AND EXPENSES

     Purchaser has retained Citibank, N.A. as Depositary and MacKenzie Partners,
Inc. as Information Agent in connection with the Offer. Citibank, N.A. and
MacKenzie will receive customary compensation and

                                       34
<PAGE>   37

reimbursement for reasonable out-of-pocket expenses, as well as indemnification
against certain liabilities in connection with the Offer, including liabilities
under applicable securities laws.

     Except as set forth above, Purchaser will not pay any fees or commissions
to any broker or dealer or other person for soliciting tenders of Shares
pursuant to the Offer. Brokers, dealers, commercial banks and trust companies
will upon request be reimbursed by Purchaser for customary mailing and handling
expenses incurred by them in forwarding the offering material to their
customers.

17. MISCELLANEOUS

     The Offer is not being made to (nor will tenders be accepted from or on
behalf of) holders of Shares in any jurisdiction in which the making of the
Offer or the acceptance thereof would not be in compliance with the laws of such
jurisdiction. However, Purchaser may, in its sole discretion, take such action
as it may deem necessary to make the Offer in any such jurisdiction and extend
the Offer to holders of Shares in such jurisdiction.

     Neither Purchaser nor Parent is aware of any jurisdiction in which the
making of the Offer or the acceptance of Shares in connection therewith would
not be in compliance with the laws of such jurisdiction.

     Purchaser and Parent have filed with the Commission the Schedule TO
(including exhibits) pursuant to Rule 14d-3 under the Exchange Act, furnishing
certain additional information with respect to the Offer and may file amendments
thereto. The Schedule TO and any amendments thereto, including exhibits, may be
examined and copies may be obtained from the principal office of the Commission
in Washington, D.C. in the manner set forth in Section 8 with respect to
information concerning the Company.

     During the last five years, neither Purchaser nor Parent nor Telmex nor, to
the best of their knowledge, any of the persons listed in Schedule A or, in the
case of Telmex, any of the persons listed in Exhibit (j) to the Schedule TO, has
been convicted in a criminal proceeding during the past five years (excluding
traffic violations or similar misdemeanors) or has been a party to any judicial
or administrative proceeding during the past five years (except for matters that
were dismissed without sanction or settlement) that resulted in a judgment,
decree or final order enjoining the person from future violations of, or
prohibiting activities subject to, federal or state securities laws, or a
finding of any violation of federal or state securities laws.

     No person has been authorized to give any information or make any
representation on behalf of Parent or Purchaser not contained in this Offer to
Purchase or in the Letter of Transmittal and, if given or made, such information
or representation must not be relied upon as having been authorized.

                                                   TPC ACQUISITION CORP.

                                       35
<PAGE>   38

                                   SCHEDULE A

  INFORMATION CONCERNING MEMBERS OF THE BOARDS OF DIRECTORS AND THE EXECUTIVE
 OFFICERS OF PARENT AND PURCHASER AND PERSONS ULTIMATELY CONTROLLING PARENT AND
                                   PURCHASER

                          GRUPO SANBORNS, S.A. DE C.V.

     Set forth below are the name, business address and present principal
occupation or employment, and material occupations, positions, offices or
employment for the past five years of each director and executive officer of
Parent. The business address of each such person is Avenida San Fernando 649,
Colonia Pena Pobre, Tlalpan, Mexico, D.F, Mexico, 14060. Each such person is a
citizen of Mexico and, unless otherwise indicated, has held his or her present
position as set forth below for the past five years.

<TABLE>
<CAPTION>
                                        PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
NAME AND POSITION WITH PARENT        MATERIAL POSITIONS HELD DURING THE PAST FIVE YEARS
- -----------------------------        --------------------------------------------------
<S>                               <C>
Carlos Slim Domit...............  Chairman of the Board and Chief Executive Officer of
(Director and CEO)                Parent since 1999 and Chairman of the Board of Grupo
                                  Carso, S.A. de C.V. since 1998. Director of Telefonos de
                                  Mexico, S.A. de C.V., President of Sanborns Hermanos
                                  since 1995.
Carlos Slim Helu................  Chairman of the Board of Telefonos de Mexico, S.A. de
(Director)                        C.V. since 1991 and Chairman of the Board of Carso
                                  Global Telecom, S.A. de C.V. since 1996. Chairman
                                  Emeritus of Grupo Carso, S.A. de C.V. since 1998,
                                  Chairman of the Board of Grupo Financiero Inbursa, S.A.
                                  de C.V. since 1998, Chairman of the Board of Grupo
                                  Carso, S.A. de C.V. between 1991 and 1998, and Chairman
                                  of the Board of Grupo Financiero Inbursa, S.A. de C.V.
                                  between 1993 and 1998.
Angel Eduardo Peralta Rosado....  Vice-Chairman of the Board of Parent since April of
(Director)                        1999. Expansion Director of Sanborns Hermanos S.A.
Juan Antonio Perez Simon........  Chairman of the Board of Sanborns Hermanos, S.A. since
(Director)                        1990 and Vice-Chairman of the Board of Telefonos de
                                  Mexico, S.A. de C.V. since 1995.
Patrick Slim Domit..............  President, Grupo Carso, S.A. de C.V. since 1998 and
(Director)                        President of Industrias Nacobre S.A. de C.V. since 1994.
Rafael Moises Kalach Mizrahi....  Chief Executive Officer and Chairman of Grupo Kaltex
(Director)                        S.A. de C.V.
Claudio X. Gonzalez Laporte.....  Chief Executive Officer and Chairman of the Board of
(Director)                        Kimberly Clark de Mexico, S.A. de C.V. Director of Carso
                                  Global Telecom, Director of Grupo Carso S.A. de C.V.
Marco Antonio Slim Domit........  Chairman of the Board of Grupo Financiero Inbursa since
(Director)                        1998. President of Banco Inbursa, S.A. since 1996,
                                  President of Seguros Inbursa, S.A. de C.V. between 1992
                                  and 1997.
Agustin Santamarina Vazquez.....  Retired. Senior Partner and Of Counsel of the law firm
(Director)                        Santamarina y Steta.
</TABLE>

- ---------------
(1) Mr. Gonzalez Laporte beneficially owns 100,000 Shares, and holds sole power
    to vote or dispose of such Shares. Each of the Slim Family, Grupo Carso S.A.
    de C.V. and Grupo Sanborns disclaims beneficial ownership of the Shares
    owned by Mr. Gonzalez Laporte.

                                       36
<PAGE>   39

                             TPC ACQUISITION CORP.

     Set forth below are the name, business address and present principal
occupation or employment, and material occupations, positions, offices or
employment for the past five years of the directors and executive officers of
Purchaser. The business address of each such person is Avenida San Fernando 649,
Colonia Pena Pobre, Tlalpan, Mexico, D.F., Mexico, 14060. Each such person is a
Mexican citizen and has held his or her present position as set forth below
since or subsequent to Purchaser's incorporation.

<TABLE>
<CAPTION>
                                           PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
NAME AND POSITION WITH PURCHASER        MATERIAL POSITIONS HELD DURING THE PAST FIVE YEARS
- --------------------------------        --------------------------------------------------
<S>                                <C>
Carlos Slim Domit
(Director and President).........  Chairman of the Board of Grupo Carso, S.A. de C.V. since
                                   1998 and Chairman of the Board and Chief Executive Officer
                                   of Grupo Sanborns, S.A. de C.V. since 1999. Director of
                                   Telefonos de Mexico, S.A. de C.V., President of Sanborns
                                   Hermanos since 1995.
Javier Cervantes Sanchez Navarro
(Director and Secretary).........  Managing Vice President, Grupo Financiero Inbursa, S.A. de
                                   C.V.
</TABLE>

                                       37
<PAGE>   40

                         PERSONS ULTIMATELY CONTROLLING
                              PARENT AND PURCHASER

     Set forth below are the name, business address and present principal
occupation or employment, and material occupations, positions, offices or
employment for the past five years of Mr. Carlos Slim Helu, Mr. Carlos Slim
Domit, Mr. Marco Antonio Slim Domit, Mr. Patrick Slim Domit, Ms. Maria Soumaya
Slim Domit, Ms. Vanessa Paola Slim Domit, and Ms. Johanna Monique Slim Domit
(collectively, the "Slim Family"), each of whom is a citizen of Mexico. The
members of the Slim Family, through a Mexican corporation and a Mexican trust,
beneficially own 61.27% of the outstanding voting equity securities of Grupo
Carso, S.A. de C.V. The principal business address for each member of the Slim
Family is Paseo de las Palmas 736, Colonia Lomas de Chapultepec, Mexico, D.F.,
Mexico, 11000. Unless otherwise indicated, each such person has held his or her
present position as set forth below for the past five years.

<TABLE>
<CAPTION>
                                         PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT;
             NAME                     MATERIAL POSITIONS HELD DURING THE PAST FIVE YEARS
             ----                     --------------------------------------------------
<S>                              <C>
Carlos Slim Helu...............  Chairman of the Board of Telefonos de Mexico, S.A. de C.V.
                                 since 1991 and Chairman of the Board of Carso Global
                                 Telecom, S.A. de C.V. since 1996. Chairman Emeritus of Grupo
                                 Carso, S.A. de C.V. since 1998, Chairman of the Board of
                                 Grupo Financiero Inbursa, S.A. de C.V. since 1998, Chairman
                                 of the Board of Grupo Carso, S.A. de C.V. between 1991 and
                                 1998, Chairman of the Board of Grupo Financiero Inbursa,
                                 S.A. de C.V. between 1993 and 1998.
Carlos Slim Domit..............  Chairman of the Board of Grupo Carso, S.A. de C.V. since
                                 1998 and Chairman of the Board and Chief Executive Officer
                                 of Grupo Sanborns, S.A. de C.V. since 1999. Director of
                                 Telefonos de Mexico, S.A. de C.V., President of Sanborns
                                 Hermanos since 1995.
Marco Antonio Slim Domit.......  Chairman of the Board of Grupo Financiero Inbursa since
                                 1998. President of Banco Inbursa, S.A. since 1996, President
                                 of Seguros Inbursa, S.A. de C.V. between 1992 and 1997.
Patrick Slim Domit.............  President, Grupo Carso, S.A. de C.V. since 1998 and
                                 President of Industrias Nacobre S.A. de C.V. since 1994.
Maria Soumaya Slim Domit.......  President, Asociacion Carso AC since 1994.
Vanessa Paola Slim Domit.......  Investor in Grupo Carso, S.A. de C.V., Carso Global Telecom
                                 and Grupo Financiero Inbursa, S.A. de C.V.
Johanna Monique Slim Domit.....  Investor in Grupo Carso, S.A. de C.V., Carso Global Telecom
                                 and Grupo Financiero Inbursa, S.A. de C.V.
</TABLE>

                                       38
<PAGE>   41

Facsimile copies of the Letter of Transmittal will be accepted. The Letter of
Transmittal, certificates for the Shares and any other required documents should
be sent by each shareholder of the Company or such shareholder's broker-dealer,
commercial bank, trust company or other nominee to the Depositary as follows:

                        The Depositary For The Offer Is:

                                 CITIBANK, N.A.

<TABLE>
<S>                             <C>                             <C>
           By Mail:                        By Hand:                       By Courier:
        Citibank, N.A.                  Citibank, N.A.              915 Broadway, 5th Floor
         P.O. Box 685               Corporate Trust Window            New York, NY 10010
      Old Chelsea Station         111 Wall Street, 5th Floor
      New York, NY 10113              New York, NY 10043
</TABLE>

                           By Facsimile Transmission:
                        (For Eligible Institutions Only)
                                 (212) 505-2248

                         Confirm Facsimile Transmission
                               By Telephone Only
                                 (800) 270-0808

Any questions or requests for assistance or additional copies of the Offer to
Purchase and the Letter of Transmittal may be directed to the Information Agent
at its telephone number and location listed below. You may also contact your
broker, dealer, commercial bank or trust company or other nominee for assistance
concerning the Offer.

                    The Information Agent for the Offer is:

                          [MACKENZIE PARTNERS, INC.]

                                156 Fifth Avenue
                            New York, New York 10010
                 Banks and brokers call collect: (212) 929-5500
                   All others call toll free: (800) 322-2885

<PAGE>   1

                             LETTER OF TRANSMITTAL
                        TO TENDER SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)
                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
       TIME, ON TUESDAY, FEBRUARY 29, 2000, UNLESS THE OFFER IS EXTENDED.

                        The Depositary for the Offer is:

                                 CITIBANK, N.A.

<TABLE>
<CAPTION>
       <S>                          <C>                                    <C>
             By Mail:                           By Hand:                         By Courier:
          Citibank, N.A.                     Citibank, N.A.                     Citibank, N.A.
           P.O. Box 685                  Corporate Trust Window            915 Broadway, 5th Floor
       Old Chelsea Station             111 Wall Street, 5th Floor             New York, NY 10010
        New York, NY 10113                 New York, NY 10043
                                       By Facsimile Transmission:
                                    (For Eligible Institutions Only)
                                             (212) 505-2248
                                    Confirm Facsimile Transmission:
                                           By Telephone Only:
                                             (800) 270-0808
</TABLE>

                         DESCRIPTION OF SHARES TENDERED
<TABLE>
<CAPTION>
<S>                                <C>                                <C>
- --------------------------------------------------------------------------------------------------------------
       NAME(S) AND ADDRESS(ES) OF REGISTERED OWNER(S)
       (PLEASE FILL IN, IF BLANK, EXACTLY AS NAME(S)                          SHARES TENDERED
                APPEAR(S) ON CERTIFICATE(S))                       (ATTACH ADDITIONAL LIST IF NECESSARY)
- --------------------------------------------------------------------------------------------------------------
                                                                                          TOTAL NUMBER OF
                                                                   CERTIFICATE           SHARES REPRESENTED
                                                                   NUMBER(S)(*)         BY CERTIFICATE(S)(*)
                                                             -------------------------------------------------

                                                             -------------------------------------------------

                                                             -------------------------------------------------

                                                             -------------------------------------------------

                                                             -------------------------------------------------

                                                             -------------------------------------------------
                                                                   TOTAL SHARES
- --------------------------------------------------------------------------------------------------------------
                             (*) Need not be completed by Book-Entry Shareholders.

  (**) Unless otherwise indicated, it will be assumed that all Shares described above are being tendered. See
                                                Instruction 4.
- --------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
<S>                                                          <C>                      <C>
       NAME(S) AND ADDRESS(ES) OF REGISTERED OWNER(S)
       (PLEASE FILL IN, IF BLANK, EXACTLY AS NAME(S)
                APPEAR(S) ON CERTIFICATE(S))
- --------------------------------------------------------------------------------------------------------------
                                                                  NUMBER OF SHARES
                                                                    TENDERED(**)
                                                             -------------------------------------------------
                                                             -------------------------------------------------
                                                             -------------------------------------------------
                                                             -------------------------------------------------
                                                             -------------------------------------------------
                                                             -------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
                             (*) Need not be completed by Bo
  (**) Unless otherwise indicated, it will be assumed that a
                                                Instruction
- --------------------------------------------------------------------------------------------------------------
</TABLE>

     DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET
FORTH ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE TRANSMISSION TO A
NUMBER OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.

     THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE COMPLETING THIS LETTER OF TRANSMITTAL.
<PAGE>   2

     This Letter of Transmittal is to be used either if certificates for Shares
(as defined below) are to be forwarded herewith or, unless an Agent's Message
(as defined in Section 3 of the Offer to Purchase (as defined below)) is
utilized, if delivery of Shares is to be made by book-entry transfer to an
account maintained by the Depositary (as defined in the Introduction to the
Offer to Purchase) at the Book-Entry Transfer Facility (as defined in Section 2
of the Offer to Purchase) pursuant to the procedures set forth in Section 3 of
the Offer to Purchase. Shareholders who deliver Shares by book-entry transfer
are referred to herein as "Book-Entry Shareholders" and other shareholders are
referred to herein as "Certificate Shareholders." Shareholders whose
certificates for Shares are not immediately available or who cannot comply with
the procedure for book-entry transfer on a timely basis, or who cannot deliver
all required documents to the Depositary prior to the Expiration Date (as
defined in Section 1 of the Offer to Purchase), may tender their Shares in
accordance with the guaranteed delivery procedure set forth in Section 3 of the
Offer to Purchase. See Instruction 2. Delivery of documents to the Book-Entry
Transfer Facility in accordance with the Book-Entry Transfer Facility's
procedures does not constitute delivery to the Depositary.

[ ]  CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
     MADE TO AN ACCOUNT MAINTAINED BY THE DEPOSITARY WITH THE BOOK-ENTRY
     TRANSFER FACILITY AND COMPLETE THE FOLLOWING (ONLY FINANCIAL INSTITUTIONS
     THAT ARE PARTICIPANTS IN THE BOOK-ENTRY TRANSFER FACILITY MAY DELIVER
     SHARES BY BOOK-ENTRY TRANSFER):

     Name of Tendering Institution:
- --------------------------------------------------------------------------------

     Account Number:
- --------------------------------------------------------------------------------

     Transaction Code Number:
- --------------------------------------------------------------------------------

[ ]  CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
     GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
     FOLLOWING:

     Name(s) of Registered Owner(s)
- --------------------------------------------------------------------------------

     Date of Execution of Notice of Guaranteed Delivery
- ----------------------------------------------------------------

     Name of Institution which Guaranteed Delivery
- ---------------------------------------------------------------------

     Account Number
- --------------------------------------------------------------------------------

     Transaction Code Number
- --------------------------------------------------------------------------------

                    NOTE: SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

                                        2
<PAGE>   3

Ladies and Gentlemen:

     The undersigned hereby tenders to TPC Acquisition Corp., a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Grupo Sanborns, S.A.
de C.V., a corporation organized under the laws of the United Mexican States
("Parent"), the above-described shares of common stock, par value $.01 per share
(the "Common Stock"), including the associated rights to purchase Common Stock
(the "Rights" and, together with the Common Stock, the "Shares"), of CompUSA
Inc., a Delaware corporation (the "Company"), pursuant to the Offer to Purchase,
dated February 1, 2000 (the "Offer To Purchase"), at a price of $10.10 per
Share, net to the seller in cash, on the terms and subject to the conditions set
forth in the Offer to Purchase, receipt of which is hereby acknowledged, and
this Letter of Transmittal (which, together with the Offer to Purchase,
constitute the "Offer"). The undersigned understands that Purchaser reserves the
right to transfer or assign, from time to time, in whole or in part, to one or
more of its affiliates, the right to purchase the Shares tendered herewith.

     On the terms and subject to the conditions of the Offer (including, if the
Offer is extended or amended, the terms and conditions of such extension or
amendment), subject to, and effective upon, acceptance for payment of, and
payment for, the Shares tendered herewith in accordance with the terms of the
Offer, the undersigned hereby sells, assigns and transfers to, or upon the order
of, Purchaser, all right, title and interest in and to all of the Shares being
tendered hereby and any and all cash dividends, distributions, rights, other
Shares or other securities issued or issuable in respect of such Shares on or
after January 24, 2000 (collectively, "Distributions"), and appoints Citibank,
N.A. (the "Depositary") the true and lawful agent and attorney-in-fact of the
undersigned with respect to such Shares (and any Distributions) with full power
of substitution (such power of attorney being deemed to be an irrevocable power
coupled with an interest) to the fullest extent of such shareholder's rights
with respect to such Shares (and any Distributions) (a) to deliver such Share
Certificates (as defined below) (and any Distributions) or transfer ownership of
such Shares (and any Distributions) on the account books maintained by the
Book-Entry Transfer Facility, together, in either such case, with all
accompanying evidence of transfer and authenticity, to or upon the order of
Purchaser, (b) to present such Shares (and any Distributions) for transfer on
the books of the Company and (c) to receive all benefits and otherwise exercise
all rights of beneficial ownership of such Shares (and any Distributions), all
in accordance with the terms and the conditions of the Offer.

     The undersigned hereby irrevocably appoints the designees of Purchaser, and
each of them, the attorneys-in-fact and proxies of the undersigned, each with
full power of substitution, to the full extent of such shareholder's rights with
respect to the Shares tendered hereby which have been accepted for payment and
with respect to any Distributions. The designees of Purchaser will, with respect
to the Shares (and any associated Distributions) for which the appointment is
effective, be empowered to exercise all voting and any other rights of such
shareholder, as they, in their sole discretion, may deem proper at any annual,
special or adjourned meeting of the Company's shareholders, by written consent
in lieu of any such meeting or otherwise. This proxy and power of attorney shall
be irrevocable and coupled with an interest in the tendered Shares. Such
appointment is effective when, and only to the extent that, Purchaser deposits
the payment for such Shares with the Depositary. Upon the effectiveness of such
appointment, without further action, all prior powers of attorney, proxies and
consents given by the undersigned with respect to such Shares (and any
associated Distributions) will be revoked and no subsequent powers of attorney,
proxies, consents or revocations may be given (and, if given, will not be deemed
effective). Purchaser reserves the right to require that, in order for Shares to
be deemed validly tendered, immediately upon Purchaser's acceptance for payment
of such Shares, Purchaser must be able to exercise full voting rights, to the
extent permitted under applicable law, with respect to such Shares (and any
associated Distributions), including voting at any meeting of shareholders.

     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the Shares (and
any Distributions) tendered hereby and, when the same are accepted for payment
by Purchaser, Purchaser will acquire good, marketable and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances and
the same will not be subject to any adverse claim. The undersigned will, upon
request, execute and deliver any additional documents deemed by the Depositary
or Purchaser to be necessary or desirable to complete the sale, assignment and
transfer of the Shares (and any Distributions) tendered hereby. In addition, the
undersigned shall promptly remit and transfer to the Depositary for the account
of Purchaser any and all Distributions in respect of the Shares tendered hereby,
accompanied by appropriate documentation of transfer and, pending such
remittance or appropriate assurance thereof, Purchaser shall be entitled to all
rights and privileges as owner of any such Distributions and may withhold the
entire purchase price or deduct from the purchase price the amount or value
thereof, as determined by Purchaser in its sole discretion.

     All authority conferred or agreed to be conferred pursuant to this Letter
of Transmittal shall not be affected by, and shall survive, the death or
incapacity of the undersigned and any obligation of the undersigned hereunder
shall be binding

                                        3
<PAGE>   4

upon the heirs, personal representatives, successors and assigns of the
undersigned. Except as stated in the Offer to Purchase, this tender is
irrevocable.

     The undersigned understands that the valid tender of Shares pursuant to one
of the procedures described in Section 3 of the Offer to Purchase will
constitute a binding agreement between the undersigned and Purchaser upon the
terms and subject to the conditions of the Offer.

     Unless otherwise indicated herein under "Special Payment Instructions",
please issue the check for the purchase price and/or return any certificates for
Shares not tendered or accepted for payment in the name(s) of the registered
owner(s) appearing under "Description of Shares Tendered." Similarly, unless
otherwise indicated under "Special Delivery Instructions," please mail the check
for the purchase price and/or return any certificates for Shares not tendered or
accepted for payment (and accompanying documents, as appropriate) to the
address(es) of the registered owner(s) appearing under "Description of Shares
Tendered". In the event that both the Special Delivery Instructions and the
Special Payment Instructions are completed, please issue the check for the
purchase price and/or issue any certificates for Shares not tendered or accepted
for payment (and any accompanying documents, as appropriate) in the name of, and
deliver such check and/or return such certificates (and any accompanying
documents, as appropriate) to, the person or persons so indicated. The
undersigned recognizes that Purchaser has no obligation pursuant to the Special
Payment Instructions to transfer any Shares from the name of the registered
owner thereof if Purchaser does not accept for payment any of the Shares so
tendered.

                                        4
<PAGE>   5

          ------------------------------------------------------------

                          SPECIAL PAYMENT INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)

        To be completed ONLY if certificate(s) for Shares not tendered or not
   accepted for payment and/or the check for the purchase price of Shares
   accepted for payment are to be issued in the name of someone other than
   the undersigned.

   Issue:  [ ] Check and/or [ ] Certificates to:

   Name:
   ----------------------------------------------------
                                    (PLEASE PRINT)

   Address:
   --------------------------------------------------
                               (INCLUDE ZIP CODE)

          ------------------------------------------------------------
                 (TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER)
          ------------------------------------------------------------
          ------------------------------------------------------------

                         SPECIAL DELIVERY INSTRUCTIONS
                         (SEE INSTRUCTIONS 1, 5 AND 7)

        To be completed ONLY if certificate(s) for Shares not tendered or not
   accepted for payment and/or the check for the purchase price of Shares
   accepted for payment are to be sent to someone other than the undersigned
   or to the undersigned at an address other than that shown above.

   Deliver: [ ] Check and/or [ ] Certificates to:

   Name:
   ----------------------------------------------------
                                    (PLEASE PRINT)

   Address:
   --------------------------------------------------
                               (INCLUDE ZIP CODE)

             ------------------------------------------------------
                 (TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER)
          ------------------------------------------------------------

                                        5
<PAGE>   6

                             IMPORTANT -- SIGN HERE
                  (PLEASE COMPLETE SUBSTITUTE FORM W-9 BELOW)

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                          (SIGNATURE(S) OF HOLDER(S))

Dated:
- --------------------------- , 2000

(Must be signed by registered owner(s) exactly as name(s) appear(s) on stock
certificate(s) or on a security position listing or by person(s) authorized to
become registered owner(s) by certificates and documents transmitted herewith.
If signature is by trustees, executors, administrators, guardians,
attorneys-in-fact, officers of corporations or others acting in a fiduciary or
representative capacity, please set forth full title and see Instruction 5.)

Name(s):------------------------------------------------------------------------
                                 (PLEASE PRINT)

Capacity (Full Title):
                ----------------------------------------------------------------

Address:
       -------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)

Area Code and Telephone Number:
                           -----------------------------------------------------
Tax Identification or
Social Security No.:
                ----------------------------------------------------------------

                           GUARANTEE OF SIGNATURE(S)

                           (SEE INSTRUCTIONS 1 AND 5)

Authorized Signature:
                ----------------------------------------------------------------

Name: --------------------------------------------------------------------------
                             (PLEASE TYPE OR PRINT)

Address:
       -------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)

Name of Firm:
           ---------------------------------------------------------------------

Dated:
- --------------------------- , 2000

                                        6
<PAGE>   7

                                  INSTRUCTIONS

             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER

     1.  GUARANTEE OF SIGNATURES.  Except as otherwise provided below, all
signatures on this Letter of Transmittal must be guaranteed by a financial
institution (including most commercial banks, savings and loan associations and
brokerage houses) that is a participant in the Security Transfer Agents
Medallion Program, the New York Stock Exchange Medallion Signature Guarantee
Program or the Stock Exchange Medallion Program (each, an "Eligible
Institution"). Signatures on this Letter of Transmittal need not be guaranteed
(a) if this Letter of Transmittal is signed by the registered owner(s) (which
term, for purposes of this document, includes any participant in any of the
Book-Entry Transfer Facility's systems whose name appears on a security position
listing as the owner of the Shares) of Shares tendered herewith and such
registered owner has not completed the box titled "Special Payment Instructions"
or the box titled "Special Delivery Instructions" on this Letter of Transmittal
or (b) if such Shares are tendered for the account of an Eligible Institution.
See Instruction 5.

     2.  DELIVERY OF LETTER OF TRANSMITTAL AND CERTIFICATES OR BOOK-ENTRY
CONFIRMATIONS.  This Letter of Transmittal is to be used either if certificates
are to be forwarded herewith or, unless an Agent's Message is utilized, if
tenders are to be made pursuant to the procedures for tender by book-entry
transfer set forth in Section 3 of the Offer to Purchase. Certificates for all
physically tendered Shares ("Share Certificates"), or confirmation of any
book-entry transfer into the Depositary's account at the Book-Entry Transfer
Facility of Shares tendered by book-entry transfer ("Book Entry Confirmation"),
as well as this Letter of Transmittal properly completed and duly executed with
any required signature guarantees, unless an Agent's Message in the case of a
book-entry transfer is utilized, and any other documents required by this Letter
of Transmittal, must be received by the Depositary at one of its addresses set
forth herein on or prior to the Expiration Date (as defined in Section 1 of the
Offer to Purchase).

     Shareholders whose certificates for Shares are not immediately available or
who cannot deliver all other required documents to the Depositary on or prior to
the Expiration Date or who cannot comply with the procedures for book-entry
transfer on a timely basis, may nevertheless tender their Shares by properly
completing and duly executing a Notice of Guaranteed Delivery pursuant to the
guaranteed delivery procedure set forth in Section 3 of the Offer to Purchase.
Pursuant to such procedure: (a) such tender must be made by or through an
Eligible Institution; (b) a properly completed and duly executed Notice of
Guaranteed Delivery substantially in the form provided by Purchaser must be
received by the Depositary prior to the Expiration Date; and (c) Share
Certificates for all tendered Shares, in proper form for transfer (or a Book
Entry Confirmation with respect to such Shares), as well as a Letter of
Transmittal (or facsimile thereof), properly completed and duly executed with
any required signature guarantees (unless, in the case of a book-entry transfer,
an Agent's Message is utilized), and all other documents required by this Letter
of Transmittal, must be received by the Depositary within three New York Stock
Exchange Inc. trading days after the date of execution of such Notice of
Guaranteed Delivery.

     A properly completed and duly executed Letter of Transmittal (or facsimile
thereof) must accompany each such delivery of Share Certificates to the
Depositary.

     THE METHOD OF DELIVERY OF SHARE CERTIFICATES AND ALL OTHER REQUIRED
DOCUMENTS, INCLUDING DELIVERY THROUGH THE BOOK-ENTRY TRANSFER FACILITY, IS AT
THE ELECTION AND RISK OF THE TENDERING SHAREHOLDER. DELIVERY OF ALL SUCH
DOCUMENTS WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY
(INCLUDING, IN THE CASE OF A BOOK-ENTRY TRANSFER, BY BOOK-ENTRY CONFIRMATION).
IF SUCH DELIVERY IS BY MAIL, IT IS RECOMMENDED THAT ALL SUCH DOCUMENTS BE SENT
BY PROPERLY INSURED REGISTERED MAIL WITH RETURN RECEIPT REQUESTED. IN ALL CASES,
SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.

     No alternative, conditional or contingent tenders will be accepted and no
fractional Shares will be purchased. All tendering shareholders, by execution of
this Letter of Transmittal (or facsimile thereof), waive any right to receive
any notice of the acceptance of their Shares for payment.

     3.  INADEQUATE SPACE.  If the space provided herein is inadequate, the
certificate numbers and/or the number of Shares should be listed on a separate
schedule attached hereto and separately signed on each page thereof in the same
manner as this Letter of Transmittal is signed.

     4.  PARTIAL TENDERS (APPLICABLE TO CERTIFICATE SHAREHOLDERS ONLY).  If
fewer than all the Shares evidenced by any certificate submitted are to be
tendered, fill in the number of Shares which are to be tendered in the box
titled "Number of Shares Tendered". In such cases, new certificate(s) for the
remainder of the Shares that were evidenced by the old

                                        7
<PAGE>   8

certificate(s) but not tendered will be sent to the registered owner, unless
otherwise provided in the appropriate box on this Letter of Transmittal, as soon
as practicable after the Expiration Date. All Shares represented by certificates
delivered to the Depositary will be deemed to have been tendered unless
otherwise indicated.

     5.  SIGNATURES ON LETTER OF TRANSMITTAL; STOCK POWERS AND ENDORSEMENTS.  If
this Letter of Transmittal is signed by the registered owner(s) of the Shares
tendered hereby, the signature(s) must correspond with the name(s) as written on
the face of the certificate(s) without alteration, enlargement or any other
change whatsoever.

     If any of the Shares tendered hereby are owned of record by two or more
joint owners, all such owners must sign this Letter of Transmittal.

     If any of the tendered Shares are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
Letters of Transmittal (or facsimiles thereof) as there are different
registrations of certificates.

     If this Letter of Transmittal or any certificates or stock powers are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and proper evidence
satisfactory to Purchaser of their authority so to act must be submitted.

     If this Letter of Transmittal is signed by the registered owner(s) of the
Shares listed and transmitted hereby, no endorsements of certificates or
separate stock powers are required unless payment is to be made to, or
certificates for Shares not tendered or accepted for payment are to be issued in
the name of, a person other than the registered owner(s). Signatures on such
certificates or stock powers must be guaranteed by an Eligible Institution.

     If this Letter of Transmittal is signed by a person other than the
registered owner(s) of the certificate(s) listed, the certificate(s) must be
endorsed or accompanied by the appropriate stock powers, in either case, signed
exactly as the name or names of the registered owner(s) or holder(s) appear(s)
on the certificate(s). Signatures on such certificates or stock powers must be
guaranteed by an Eligible Institution.

     6.  STOCK TRANSFER TAXES.  Purchaser will pay any stock transfer taxes with
respect to the transfer and sale of Shares to it or to its order pursuant to the
Offer. If, however, payment of the purchase price is to be made to, or (in the
circumstances permitted hereby) if certificates for Shares not tendered or
accepted for payment are to be registered in the name of, any person other than
the registered owner(s), or if tendered certificates are registered in the name
of any person other than the person signing this Letter of Transmittal, the
amount of any stock transfer taxes (whether imposed on the registered owner(s)
or such person) payable on account of the transfer to such person will be
deducted from the purchase price if satisfactory evidence of the payment of such
taxes, or exemption therefrom, is not submitted.

     EXCEPT AS PROVIDED IN THIS INSTRUCTION 6, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE SHARE CERTIFICATES LISTED IN THIS
LETTER OF TRANSMITTAL.

     7.  SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS.  If a check is to be issued
in the name of, and/or certificates for Shares not tendered or accepted for
payment are to be issued or returned to, a person other than the signer(s) of
this Letter of Transmittal or if a check and/or such certificates are to be
mailed to a person other than the signer(s) of this Letter of Transmittal or to
an address other than that shown above, the appropriate boxes on this Letter of
Transmittal should be completed.

     8.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Questions or requests
for assistance may be directed to the Information Agent at its address set forth
below or from your broker, dealer, commercial bank or trust company. Additional
copies of the Offer to Purchase, this Letter of Transmittal, the Notice of
Guaranteed Delivery and other tender offer materials may be obtained from the
Information Agent as set forth below, and will be furnished at Purchaser's
expense.

     9.  SUBSTITUTE FORM W-9.  Each tendering shareholder is required to provide
the Depositary with a correct Taxpayer Identification Number ("TIN"), generally
the shareholder's social security or federal employer identification number, on
Substitute Form W-9 below, or otherwise establish such shareholder's exemption
to the satisfaction of the Depositary. Failure to provide the information on the
form may subject the tendering shareholder to 31 percent federal income tax
backup withholding on the payment of the purchase price. The tendering
shareholder may write "Applied For" in Part I of the Form if the tendering
shareholder has not been issued a TIN and has applied for a TIN or intends to
apply for a TIN in the near future. If the Shareholder has written "Applied for"
in Part I of the Form, the shareholder must also complete the Certificate of
Awaiting Taxpayer Identification Number. Notwithstanding that "Applied For" is
written in Part I of the Substitute Form W-9 and that the shareholder has
completed the Certificate of Awaiting Taxpayer

                                        8
<PAGE>   9

Identification Number, the Depositary will withhold 31 percent of all payments
of the purchase price thereafter until a TIN is provided to the Depositary,
unless the shareholder has filed a Form W-8BEN or otherwise established an
exemption. See Important Tax Information below.

     10.  LOST, DESTROYED, MUTILATED OR STOLEN CERTIFICATES.  If any
certificate(s) representing Shares has been lost, destroyed, mutilated or
stolen, the shareholder should promptly notify the Company's stock transfer
agent, American Stock Transfer & Trust Company at 6201 15th Avenue, Brooklyn,
N.Y. 11219, Att: Donna Ansbro, Telephone (718) 921-8261, Fax (718) 921-8337. The
shareholder will then be instructed as to the steps that must be taken in order
to replace the certificate(s). This Letter of Transmittal and related documents
cannot be processed until the procedures for replacing lost, mutilated or
destroyed certificates have been followed.

     IMPORTANT:  THIS LETTER OF TRANSMITTAL (OR A FACSIMILE COPY THEREOF) OR AN
AGENT'S MESSAGE, TOGETHER WITH SHARE CERTIFICATES OR BOOK-ENTRY CONFIRMATION OR
A PROPERLY COMPLETED AND DULY EXECUTED NOTICE OF GUARANTEED DELIVERY AND ALL
OTHER REQUIRED DOCUMENTS MUST BE RECEIVED BY THE DEPOSITARY ON OR PRIOR TO THE
EXPIRATION DATE.

                                        9
<PAGE>   10

                           IMPORTANT TAX INFORMATION

     Under the federal income tax law, a shareholder whose tendered Shares are
accepted for purchase is required by law to provide the Depositary with such
shareholder's correct TIN on Substitute Form W-9 below and to certify that such
TIN is correct (or that such shareholder is awaiting a TIN) or otherwise
establish a basis for exemption from backup withholding. If such shareholder is
an individual, the TIN is his or her social security number. If a shareholder
fails to provide a correct TIN to the Depositary, such shareholder may be
subject to a $50.00 penalty imposed by the Internal Revenue Service. In
addition, payments that are made to such shareholder with respect to Shares
purchased pursuant to the Offer may be subject to backup withholding of 31
percent.

     Certain shareholders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, that shareholder must generally submit a Form W-8BEN, signed under
penalties of perjury, attesting to that individual's exempt status. A Form
W-8BEN can be obtained from the Depositary.

     If backup withholding applies, the Depositary is required to withhold 31
percent of any payments made to the shareholder or payee. Backup withholding is
not an additional tax. Rather, the federal income tax liability of persons
subject to backup withholding will be reduced by the amount of tax withheld. If
withholding results in an overpayment of taxes, a refund may be obtained from
the Internal Revenue Service.

     If backup withholding applies and "Applied for" is written in Part I of the
Substitute Form W-9 and the Shareholder has completed the Certificate of
Awaiting Taxpayer Identification Number, the Depositary will retain 31 percent
of any payment of the purchase price for tendered Shares during the 60-day
period following the date of the Substitute Form W-9. If a shareholder's TIN is
provided to the Depositary within 60 days of the date of the Substitute Form
W-9, payment of such retained amounts will be made to such shareholder. If a
shareholder's TIN is not provided to the Depositary within such 60-day period,
the Depositary will remit such retained amounts to the Internal Revenue Service
as backup withholding and shall withhold 31 percent of any payment of the
purchase price for the tendered Shares made to such shareholder thereafter
unless such shareholder furnishes a TIN to the Depositary prior to such payment.

PURPOSE OF SUBSTITUTE FORM W-9

     To prevent backup withholding on payments made to a shareholder whose
tendered Shares are accepted for purchase for shareholders other than foreign
persons who provide an appropriate Form W-8BEN, the shareholder should complete
and sign the Substitute Form W-9 included in this Letter of Transmittal and
provide the shareholder's correct TIN and certify, under penalties of perjury,
that the TIN provided on such Form is correct (or that such shareholder is
awaiting a TIN) and that (i) such shareholder is exempt from backup withholding;
(ii) such shareholder has not been notified by the Internal Revenue Service that
such shareholder is subject to backup withholding as a result of failure to
report all interest or dividends; or (iii) the Internal Revenue Service has
notified the shareholder that the shareholder is no longer subject to backup
withholding. The shareholder must sign and date the Substitute Form W-9 where
indicated, certifying that the information on such Form is correct.

WHAT NUMBER TO GIVE THE DEPOSITARY

     The shareholder is required to give the Depositary the social security
number or employer identification number of the record owner of the Shares. If
the Shares are in more than one name or are not in the name of the actual owner,
consult the enclosed Guidelines for Certification of Taxpayer Identification
Number on Substitute Form W-9 for additional guidance on which number to report.

                                       10
<PAGE>   11

                 TO BE COMPLETED BY ALL TENDERING SHAREHOLDERS
                              (SEE INSTRUCTION 9)

                             PAYER: CITIBANK, N.A.

<TABLE>
<CAPTION>
<S>                                    <C>                                    <C>
- ----------------------------------------------------------------------------
  SUBSTITUTE                           Name:
  FORM W-9                             Address:
  DEPARTMENT OF THE TREASURY           Check appropriate box:                 Corporation [ ]
  INTERNAL REVENUE SERVICE             Individual [ ]
  REQUEST FOR TAXPAYER                 Partnership [ ]                        Other (specify) [ ]
  IDENTIFICATION NUMBER (TIN)
  AND CERTIFICATION
- ----------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

<S>                                                            <C>
- ---------------------------------------------------------------------------------------------------------
PART I.   Please provide your taxpayer identification          SSN:
          number in the space at right. If awaiting TIN,             ------------------------------------
          write "Applied For" in space at right and            EIN:------------------------------
           complete the Certificate of Awaiting Taxpayer
           Identification Number below.
- ------------------------------------------------------------------------------------------------------------
</TABLE>

  PART II.   For Payees exempt from backup withholding, see the enclosed
             "Guidelines for Certification of Taxpayer Identification Number
             on Substitute Form W-9" and complete as instructed therein.
- --------------------------------------------------------------------------------
  PART III.  CERTIFICATION

  Under penalties of perjury, I certify that:

  (1) The number shown on this form is my correct Taxpayer Identification
      Number (or, as indicated, I am waiting for a number to be issued to
      me); and

  (2) I am not subject to backup withholding because: (a) I am exempt from
      backup withholding, or (b) I have not been notified by the IRS that I
      am subject to backup withholding as a result of a failure to report all
      interests or dividends, or (c) the IRS has notified me that I am no
      longer subject to backup withholding.

  Certification Instructions -- You must cross out item (2) above if you have
  been notified by the IRS that you are subject to backup withholding because
  of underreporting of interest or dividends on your tax return. However, if
  after being notified by the IRS that you were subject to backup withholding
  you received another notification from the IRS that you are no longer
  subject to backup withholding, do not cross out item (2).
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                             <C>
Signature                                                       Date                                 2000
- ------------------------------------------------------------
</TABLE>

YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU WROTE "APPLIED FOR" IN PART I
                          OF THIS SUBSTITUTE FORM W-9
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
- --------------------------------------------------------------------------------
        I certify under penalties of perjury that a taxpayer identification
   number has not been issued to me, and either (a) I have mailed or
   delivered an application to receive a taxpayer identification number to
   the appropriate Internal Revenue Service Center or Social Security
   Administration Office or (b) I intend to mail or deliver an application in
   the near future. I understand that, notwithstanding the information I
   provided in Part III of the Substitute Form W-9 (and the fact that I have
   completed this Certificate of Awaiting Taxpayer Identification Number),
   all reportable payments made to me hereafter will be subject to a 31
   percent backup withholding tax until I provide a properly certified
   taxpayer identification number.

<TABLE>
<S>                                                  <C>
- -------------------------------------------------    -------------------------------------------------
Signature                                            Date
</TABLE>

NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
 OF 31 PERCENT OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
 THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON
                  SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

                                       11
<PAGE>   12

                        The Depositary for the Offer is:

                                 CITIBANK, N.A.

<TABLE>
<S>                             <C>                             <C>
           By Mail:                        By Hand:                       By Courier:
        Citibank, N.A.                  Citibank, N.A.                  Citibank, N.A.
         P.O. Box 685               Corporate Trust Window          915 Broadway, 5th Floor
      Old Chelsea Station         111 Wall Street, 5th Floor          New York, NY 10010
      New York, NY 10113              New York, NY 10043
</TABLE>

                           By Facsimile Transmission:
                        (For Eligible Institutions Only)
                                 (212) 505-2248

                        Confirm Facsimile Transmission:
                               By Telephone Only:
                                 (800) 270-0808

                    The Information Agent for the Offer is:

                          [MACKENZIE PARTNERS, INC.]

                                156 Fifth Avenue
                            New York, New York 10010
                 Banks and Brokers Call Collect: (212) 929-5500
                   All Others Call Toll-Free: (800) 322-2885

February 1, 2000

<PAGE>   1

                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                     ALL OUTSTANDING SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)
                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

     As set forth in Section 3 of the Offer to Purchase (as defined below), this
form, or a form substantially equivalent to this form, must be used to accept
the Offer (as defined below) if the certificates representing shares of common
stock, par value $.01 per share, of CompUSA Inc., a Delaware corporation (the
"Company"), including the associated common stock purchase rights issued
pursuant to the Rights Agreement, dated as of April 29, 1994, as amended as of
January 23, 2000, between the Company and American Stock Transfer & Trust
Company (formerly Bank One, Texas, N.A.), as Rights Agent (the "Shares"), are
not immediately available or time will not permit all required documents to
reach Citibank, N.A. (the "Depositary") prior to the Expiration Date (as defined
in the Offer to Purchase) or the procedures for book-entry transfer cannot be
completed on a timely basis. Such form may be delivered by hand or transmitted
by facsimile transmission or mailed to the Depositary and must include a
guarantee by an Eligible Institution (as defined in the Offer to Purchase). See
Section 3 of the Offer to Purchase.

                        THE DEPOSITARY FOR THE OFFER IS:

                                 Citibank, N.A.

<TABLE>
<S>                             <C>                             <C>
          By Mail:                        By Hand:                      By Courier:
       Citibank, N.A.                  Citibank, N.A.                  Citibank, N.A.
        P.O. Box 685               Corporate Trust Window         915 Broadway, 5th Floor
    Old Chelsea Station          111 Wall Street, 5th Floor          New York, NY 10010
     New York, NY 10113              New York, NY 10043
                                 By Facsimile Transmission:
                              (For Eligible Institutions Only)
                                       (212) 505-2248
                               Confirm Facsimile Transmission
                             By Telephone Only: (800) 270-0808
</TABLE>

 DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS SET
 FORTH ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN
             AS LISTED ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.

     This Notice of Guaranteed Delivery is not to be used to guarantee
signatures. If a signature on a Letter of Transmittal is required to be
guaranteed by an Eligible Institution under the instructions thereto, such
signature guarantee must appear in the applicable space provided in the
signature box on the Letter of Transmittal.
<PAGE>   2

Ladies and Gentlemen:

     The undersigned hereby tenders to TPC Acquisition Corp., a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Grupo Sanborns, S.A.
de C.V., a corporation organized under the laws of the United Mexican States
("Parent"), upon the terms and subject to the conditions set forth in the Offer
to Purchase, dated February 1, 2000 (the "Offer to Purchase"), and the related
Letter of Transmittal (which, as amended or supplemented from time to time,
together constitute the "Offer"), receipt of which is hereby acknowledged, the
number of Shares indicated below pursuant to the guaranteed delivery procedure
set forth in Section 3 of the Offer to Purchase.

<TABLE>
<S>                                             <C>

Number of Shares:                               Name(s) of Record Holder(s):
- ------------------------------                  -----------------------------------------
                                                -----------------------------------------
Share Certificate Numbers (if available):       PLEASE TYPE OR PRINT
- -----------------------------------------
- -----------------------------------------       Address(es):
                                                ------------------------------------
If Shares will be delivered by book-entry
transfer:                                       Zip Code
                                                ----------------------------------------
Account                                         -----------------------------------------
Number:
- ----------------------------------------        Telephone Number:
                                                -----------------------------------------
Date:             , 2000                        AREA CODE
                                                Signature(s):
                                                -----------------------------------------
                                                -----------------------------------------
</TABLE>

                                        2
<PAGE>   3
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)

     The undersigned, a participant in the Security Transfer Agents Medallion
Program, the New York Stock Exchange Medallion Signature Guarantee Program or
the Stock Exchange Medallion Program (each, an "Eligible Institution"), hereby
guarantees that either the certificates representing the Shares tendered hereby
in proper form for transfer or timely confirmation of a book-entry transfer of
such Shares into the Depositary's account at the Book-Entry Transfer Facility
(as defined in and pursuant to procedures set forth in Section 3 of the Offer to
Purchase), together with a properly completed and duly executed Letter of
Transmittal (or facsimile thereof) with any required signature guarantees (or,
in the case of a book-entry transfer, an Agent's Message (as defined in the
Offer to Purchase)) and any other documents required by the Letter of
Transmittal, will be received by the Depositary at one of its addresses set
forth above within three (3) New York Stock Exchange Inc. trading days after the
date of execution hereof.

     The Eligible Institution that completes this form must communicate the
guarantee to the Depositary and must deliver the Letter of Transmittal,
certificates for Shares and/or any other required documents to the Depositary
within the time period shown above. Failure to do so could result in a financial
loss to such Eligible Institution.

Name of Firm:
- --------------------------------------------------------------------------------

Address:
- --------------------------------------------------------------------------------
                                                                        ZIP CODE

Area Code and
Telephone Number:
- --------------------------------------------------------------------------------

AUTHORIZED SIGNATURE
Name:
- --------------------------------------------------------------------------------
                              PLEASE TYPE OR PRINT

Title:
- --------------------------------------------------------------------------------
Dated:                                                                     2000
- ---------------------------------------------------------------------------

NOTE: DO NOT SEND CERTIFICATES FOR SHARES WITH THIS NOTICE OF GUARANTEED
DELIVERY. CERTIFICATES FOR SHARES ARE TO BE DELIVERED WITH THE LETTER OF
TRANSMITTAL.

                                        3

<PAGE>   1

                           OFFER TO PURCHASE FOR CASH

                     ALL OUTSTANDING SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)
                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
       TIME, ON TUESDAY, FEBRUARY 29, 2000, UNLESS THE OFFER IS EXTENDED.

                                                                February 1, 2000

To Brokers, Dealers, Commercial Banks,
Trust Companies and Other Nominees:

     We have been engaged by TPC Acquisition Corp., a Delaware corporation
("Purchaser") and a wholly owned subsidiary of Grupo Sanborns, S.A. de C.V., a
corporation organized under the laws of the United Mexican States ("Parent"), to
act as Information Agent in connection with its offer to purchase all of the
outstanding shares of common stock, par value $.01 per share, of CompUSA Inc., a
Delaware corporation (the "Company"), including the associated common stock
purchase rights issued pursuant to the Rights Agreement, dated as of April 29,
1994, as amended as of January 23, 2000, between the Company and American Stock
Transfer & Trust Company (formerly Bank One, Texas, N.A.), as Rights Agent (the
"Shares"), at $10.10 per Share, net to the seller in cash, upon the terms and
subject to the conditions set forth in the Offer to Purchase, dated February 1,
2000 (the "Offer to Purchase") of Purchaser and in the related Letter of
Transmittal (which, as amended or supplemented from time to time, together
constitute the "Offer"). Please furnish copies of the enclosed materials to
those of your clients for whom you hold Shares registered in your name or in the
name of your nominee.

     THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, THERE BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION OF THE OFFER, THAT NUMBER OF
SHARES WHICH, TOGETHER WITH ANY SHARES THEN BENEFICIALLY OWNED BY PARENT OR
PURCHASER OR ANY OF THEIR RESPECTIVE AFFILIATES, REPRESENTS AT LEAST TWO-THIRDS
OF THE ISSUED AND OUTSTANDING SHARES ON A FULLY DILUTED BASIS.

     Enclosed herewith are the following documents:

          1.  Offer to Purchase, dated February 1, 2000;

          2.  Letter of Transmittal to be used by shareholders of the Company in
     accepting the Offer;

          3.  Notice of Guaranteed Delivery;

          4.  Guidelines for Certification of Taxpayer Identification Number on
     Substitute Form W-9;
<PAGE>   2

          5.  Letter to shareholders of the Company from the President and Chief
     Executive Officer of the Company, accompanied by the Company's
     Solicitation/Recommendation Statement on Schedule 14D-9;

          6.  A printed form of a letter that may be sent to your clients for
     whose account you hold Shares in your name or in the name of your nominee,
     with space provided for obtaining such clients' instructions with regard to
     the Offer; and

          7.  Return envelope addressed to Citibank, N.A., the Depositary.

     The Offer is being made pursuant to a Merger Agreement (the "Merger
Agreement"), dated as of January 23, 2000, by and among the Company, Parent and
Purchaser, pursuant to which, after completion of the Offer and the satisfaction
or waiver of certain conditions, Purchaser will be merged with and into the
Company and the Company will be the surviving corporation (the "Merger") and
each issued and outstanding Share (other than Shares owned by Parent, Purchaser
or any subsidiary or affiliate of Parent, Purchaser or the Company or held in
the treasury of the Company or held by shareholders who properly exercise
dissenters' rights, if any) will, by virtue of the Merger and without any action
on the part of the holder thereof, be converted into and represent the right to
receive the price per Share paid by Purchaser pursuant to the Offer, without
interest.

     THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE MERGER
AGREEMENT, THE OFFER AND THE MERGER, DETERMINED THAT THE OFFER AND THE MERGER
ARE ADVISABLE AND FAIR TO, AND IN THE BEST INTERESTS OF, THE HOLDERS OF SHARES
(OTHER THAN PARENT AND ITS AFFILIATES) AND UNANIMOUSLY RECOMMENDS THAT
SHAREHOLDERS ACCEPT THE OFFER AND TENDER THEIR SHARES PURSUANT TO THE OFFER.

     Upon the terms and subject to the conditions of the Offer (including, if
the Offer is extended or amended, the terms and conditions of any such extension
or amendment), Purchaser will be deemed to have accepted for payment, and will
pay for, all Shares validly tendered and not properly withdrawn by the
Expiration Date (as defined in the Offer to Purchase) as, if and when Purchaser
gives oral or written notice to the Depositary of the Purchaser's acceptance of
the tenders of such Shares for payment pursuant to the Offer. Payment for Shares
accepted for payment pursuant to the Offer will be made only after timely
receipt by the Depositary of (a) certificates for (or a Book-Entry Confirmation
(as defined in the Offer to Purchase) with respect to) such Shares, (b) a
properly completed and duly executed Letter of Transmittal (or facsimile
thereof) or, in the case of a book-entry transfer, an Agent's Message (as
defined in the Offer to Purchase) in lieu of the Letter of Transmittal and (c)
any other documents required by the Letter of Transmittal. Accordingly,
tendering shareholders may be paid at different times depending upon when
certificates for Shares or Book-Entry Confirmations with respect to Shares are
actually received by the Depositary. UNDER NO CIRCUMSTANCES WILL INTEREST BE
PAID ON THE PURCHASE PRICE FOR SHARES, REGARDLESS OF ANY EXTENSION OF THE OFFER
OR ANY DELAY IN MAKING PAYMENT PURSUANT TO THE OFFER.

     The Offer is not being made to (nor will tenders be accepted from or on
behalf of) holders of Shares in any jurisdiction in which the making or
acceptance of the Offer would not be in compliance with the laws of such
jurisdiction. In any jurisdiction where the securities, blue sky or other laws
require the Offer to be made by a licensed broker or dealer, the Offer will be
deemed to be made on behalf of Purchaser by one or more registered brokers or
dealers that are licensed under the laws of such jurisdiction. An envelope in
which to return your instructions to us is enclosed. If you authorize tender of
your Shares, all such Shares will be tendered unless otherwise indicated in such
instruction form. Please forward your instructions to us as soon as possible to
allow us ample time to tender Shares on your behalf prior to the expiration of
the Offer.

     In order to tender Shares pursuant to the Offer, a properly completed and
duly executed Letter of Transmittal (or facsimile thereof), with any required
signature guarantees, or an Agent's Message (in the case of any book-entry
transfer), and any other documents required by the Letter of Transmittal, should
be sent to the Depositary, and either certificates representing the tendered
Shares should be delivered or such Shares must be delivered to the Depositary
pursuant to the procedures for book-entry transfers, all in accordance with the
instructions set forth in the Letter of Transmittal and the Offer to Purchase.

                                        2
<PAGE>   3

     Neither Parent nor Purchaser will pay any fees or commissions to any broker
or dealer or other person (other than the Information Agent and the Depositary
as described in the Offer to Purchase) in connection with the solicitation of
tenders of Shares pursuant to the Offer. You will be reimbursed upon request for
customary mailing and handling expenses incurred by you in forwarding the
enclosed offering materials to your clients.

     YOUR PROMPT ACTION IS REQUESTED. WE URGE YOU TO CONTACT YOUR CLIENTS AS
PROMPTLY AS POSSIBLE. THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00
MIDNIGHT, NEW YORK CITY TIME, ON TUESDAY, FEBRUARY 29, 2000, UNLESS THE OFFER IS
EXTENDED.

     Any inquiries you may have with respect to the Offer may be addressed to
the undersigned at the address and telephone numbers set forth on the back cover
page of the Offer to Purchase. Additional copies of enclosed materials may be
obtained from the Information Agent and will be furnished at Purchaser's
expense.

                                          Very truly yours,

                                          [MACKENZIE PARTNERS, INC.]

     NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL RENDER YOU OR
ANY PERSON THE AGENT OF PURCHASER, PARENT, THE COMPANY, ANY AFFILIATE OF THE
COMPANY, THE INFORMATION AGENT OR THE DEPOSITARY, OR AUTHORIZE YOU OR ANY OTHER
PERSON TO USE ANY DOCUMENT OR MAKE ANY REPRESENTATION ON BEHALF OF ANY OF THEM
WITH RESPECT TO THE OFFER NOT CONTAINED IN THE OFFER TO PURCHASE OR THE LETTER
OF TRANSMITTAL.

                                        3

<PAGE>   1

                           OFFER TO PURCHASE FOR CASH

                     ALL OUTSTANDING SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)
                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
       TIME, ON TUESDAY, FEBRUARY 29, 2000, UNLESS THE OFFER IS EXTENDED.

                                                                February 1, 2000

To Holders of Common Stock of CompUSA Inc.:

     Enclosed for your information is an Offer to Purchase, dated February 1,
2000 ("Offer to Purchase"), and the related Letter of Transmittal (which, as
amended or supplemented from time to time, together constitute the "Offer"),
relating to the Offer by TPC Acquisition Corp., a Delaware corporation
("Purchaser") and a wholly owned subsidiary of Grupo Sanborns, S.A. de C.V., a
corporation organized under the laws of the United Mexican States ("Parent"), to
purchase all of the outstanding shares of common stock, par value $.01 per
share, of CompUSA Inc., a Delaware corporation (the "Company"), including the
associated common stock purchase rights issued pursuant to the Rights Agreement,
dated as of April 29, 1994, as amended as of January 23, 2000, between the
Company and American Stock Transfer & Trust Company (formerly Bank One, Texas,
N.A.), as Rights Agent (the "Shares"), at $10.10 per Share, net to the seller in
cash, upon the terms and subject to the conditions set forth in the Offer. Also
enclosed is a letter to shareholders of the Company from the President and Chief
Executive Officer of the Company, accompanied by the Company's
Solicitation/Recommendation Statement on Schedule 14D-9.

     WE ARE THE HOLDER OF RECORD OF SHARES HELD BY US FOR YOUR ACCOUNT. A TENDER
OF SUCH SHARES CAN BE MADE ONLY BY US AS THE HOLDER OF RECORD AND PURSUANT TO
YOUR INSTRUCTIONS. THE LETTER OF TRANSMITTAL ACCOMPANYING THIS LETTER IS
FURNISHED TO YOU FOR YOUR INFORMATION ONLY AND CANNOT BE USED BY YOU TO TENDER
SHARES HELD BY US FOR YOUR ACCOUNT.

     We request instructions as to whether you wish to tender any or all of the
Shares held by us for your account, pursuant to the terms and conditions set
forth in the Offer.

     Your attention is directed to the following:

          1.  The offer price is $10.10 per Share, net to the seller in cash,
     without interest thereon, upon the terms and subject to the conditions of
     the Offer.

          2.  The Offer is being made for all of the outstanding Shares which
     are not owned by Parent or its affiliates.

          3.  The Offer is being made pursuant to a Merger Agreement (the
     "Merger Agreement"), dated as of January 23, 2000, by and among Company,
     Parent and Purchaser, pursuant to which, after completion of the Offer,
     Purchaser will be merged with and into the Company and the Company will be
     the surviving
<PAGE>   2

     corporation (the "Merger"), and each issued and outstanding Share (other
     than Shares owned by Parent, Purchaser or any subsidiary or affiliate of
     Parent, Purchaser or the Company or held in the treasury of the Company or
     Shares which are held by shareholders who properly exercise dissenters'
     rights, if any) shall, by virtue of the Merger, and without any action on
     the part of the holder thereof, be converted into and represent the right
     to receive the price per Share paid by Purchaser in the Offer, without
     interest.

          4. THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE
     MERGER AGREEMENT, THE OFFER AND THE MERGER, DETERMINED THAT THE OFFER AND
     THE MERGER ARE ADVISABLE AND FAIR TO, AND IN THE BEST INTERESTS OF, THE
     HOLDERS OF SHARES (OTHER THAN PARENT AND ITS AFFILIATES) AND UNANIMOUSLY
     RECOMMENDS THAT SHAREHOLDERS ACCEPT THE OFFER AND TENDER THEIR SHARES
     PURSUANT TO THE OFFER.

          5. The Offer is conditioned upon, among other things, there being
     validly tendered and not withdrawn prior to the expiration of the Offer,
     that number of Shares which, together with any Shares then beneficially
     owned by Parent or Purchaser or any of their respective affiliates,
     represents at least two-thirds of the issued and outstanding Shares on a
     fully diluted basis (the "Minimum Tender Condition"). Subject to the terms
     of the Merger Agreement, the Offer is also subject to other terms and
     conditions, including receipt of certain regulatory approvals, set forth in
     the Offer to Purchase. Any or all conditions to the Offer may be waived by
     Purchaser.

          6. The Offer and withdrawal rights will expire at 12:00 midnight, New
     York City time, on Tuesday, February 29, 2000, unless the Offer is
     extended.

          7. Any stock transfer taxes applicable to the sale of Shares to
     Purchaser pursuant to the Offer will be paid by Purchaser, except as
     otherwise provided in Instruction 6 of the Letter of Transmittal.

     If you wish to have us tender any or all of the Shares held by us for your
account, please so instruct us by completing, executing and returning to us the
instruction form set forth below. Please forward your instructions to us in
ample time to permit us to submit a tender on your behalf prior to the
expiration of the Offer. If you authorize the tender of your Shares, all such
Shares will be tendered unless otherwise specified on the instruction form set
forth below.

     Payment for Shares accepted for payment pursuant to the Offer will be in
all cases made only after timely receipt by Citibank, N.A. (the "Depositary"),
of (a) certificates for (or a Book-Entry Confirmation (as defined in the Offer
to Purchase) with respect to) such Shares, (b) a Letter of Transmittal (or
facsimile thereof), properly completed and duly executed, with any required
signature guarantees, or, in the case of a book-entry transfer effected pursuant
to the procedure set forth in Section 3 of the Offer to Purchase, an Agent's
Message (as defined in the Offer to Purchase) in lieu of the Letter of
Transmittal and (c) any other documents required by the Letter of Transmittal.
Accordingly, tendering shareholders may be paid at different times depending
upon when certificates for Shares or Book-Entry Confirmations with respect to
Shares are actually received by the Depositary. UNDER NO CIRCUMSTANCES WILL
INTEREST BE PAID ON THE PURCHASE PRICE FOR SHARES, REGARDLESS OF ANY EXTENSION
OF THE OFFER OR ANY DELAY IN MAKING PAYMENT PURSUANT TO THE OFFER.

     The Offer is not being made to (nor will tenders be accepted from, or on
behalf of) holders of Shares in any jurisdiction in which the making or
acceptance of the Offer would not be in compliance with the laws of such
jurisdiction. In any jurisdiction where the securities or blue sky laws require
the Offer to be made by a licensed broker or dealer, the Offer will be deemed
made on behalf of Purchaser by the registered brokers or dealers that are
licensed under the laws of such jurisdiction. An envelope in which to return
your instructions to us is enclosed.

                                        2
<PAGE>   3

                        INSTRUCTIONS WITH RESPECT TO THE
                           OFFER TO PURCHASE FOR CASH

                     ALL OUTSTANDING SHARES OF COMMON STOCK
           (INCLUDING THE ASSOCIATED RIGHTS TO PURCHASE COMMON STOCK)

                                       OF

                                  COMPUSA INC.
                                       AT

                              $10.10 NET PER SHARE
                                       BY

                             TPC ACQUISITION CORP.
                          A WHOLLY OWNED SUBSIDIARY OF

                          GRUPO SANBORNS, S.A. DE C.V.

     The undersigned acknowledge(s) receipt of your letter and the enclosed
Offer to Purchase, dated February 1, 2000, and the related Letter of
Transmittal, in connection with the offer by TPC Acquisition Corp., a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Grupo Sanborns, S.A.
de C.V., a corporation organized under the laws of the United Mexican States
("Parent"), to purchase for cash all of the outstanding shares of common stock,
par value $.01 per share, of CompUSA Inc., a Delaware corporation (the
"Company"), including the associated common stock purchase rights issued
pursuant to the Rights Agreement, dated as of April 29, 1994, as amended as of
January 23, 2000, between the Company and American Stock Transfer & Trust
Company (formerly Bank One, Texas, N.A.), as Rights Agent (the "Shares") at
$10.10 per Share, net to the seller in cash, upon the terms and conditions set
forth in the Offer.

     This will instruct you to tender the number of Shares indicated below (or
if no number is indicated below, all Shares) that are held by you for the
account of the undersigned, upon the terms and subject to the conditions set
forth in the Offer and the related Letter of Transmittal.

Dated:            , 2000

                        NUMBER OF SHARES TO BE TENDERED:

                                    SHARES*

- --------------------------------------------------------------------------------
                                  SIGNATURE(S)

- --------------------------------------------------------------------------------
                              PLEASE PRINT NAME(S)

- --------------------------------------------------------------------------------
                            PLEASE PRINT ADDRESS(ES)

- --------------------------------------------------------------------------------
                       AREA CODE AND TELEPHONE NUMBER(S)

- --------------------------------------------------------------------------------
                TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER(S)
* Unless otherwise indicated, it will be assumed that all your Shares are to be
  tendered.

<PAGE>   1

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

GUIDELINES FOR DETERMINING THE PROPER NAME AND IDENTIFICATION NUMBER TO GIVE THE
PAYER.--Social Security numbers have nine digits separated by two hyphens: i.e.
000-00-0000. Employer identification numbers have nine digits separated by only
one hyphen: i.e. 00-0000000. The table below will help determine the name and
number to give the payer.

<TABLE>
<S>  <C>                                 <C>
- ------------------------------------------------------------
                                         GIVE THE NAME AND
FOR THIS TYPE OF ACCOUNT:                SOCIAL SECURITY
                                         NUMBER OF--
- ------------------------------------------------------------
 1.  An individual account               The individual
 2.  Two or more individuals (joint      The actual owner of
     account)                            the account or, if
                                         combined funds, any
                                         one of the
                                         individuals(1)
 3.  Custodian account of a minor        The minor(2)
     (Uniform Gift to Minors Act)
 4.  a. The usual revocable savings      The grantor-
        trust account (grantor is also   trustee(1)
        trustee)
- ------------------------------------------------------------
- ------------------------------------------------------------
FOR THIS TYPE OF ACCOUNT:                GIVE THE NAME AND
                                         EMPLOYER
                                         IDENTIFICATION
                                         NUMBER OF--
- ------------------------------------------------------------

     b. So-called trust account that is  The actual owner(1)
        not a legal or valid trust
        under State law
 5.  Sole proprietorship account         The owner(3)
 6.  A valid trust, estate or pension    The legal entity(4)
     trust
 7.  Corporate account                   The corporation
 8.  Association, club, religious,       The organization
     charitable, educational or other
     tax-exempt organization account
 9.  Partnership                         The partnership
10.  A broker or registered nominee      The broker or
                                         Nominee
11.  Account with the Department of      The public entity
     Agriculture in the name of a
     public entity (such as a State or
     local government, school district,
     or prison) that receives
     agricultural program payments
- ------------------------------------------------------------
</TABLE>

(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) You must show your individual name, but you may also enter your business or
    "doing business as" name. You may use either your Social Security Number or
    Employer Identification Number.
(4) List first and circle the name of the legal trust, estate, or pension trust.
    (Do not furnish the identifying number of the personal representative or
    trustee unless the legal entity itself is not designated in the account
    title.)

NOTE: If no name is circled when more than one name is listed, the number will
      be considered to be that of the first name listed.
<PAGE>   2

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
                                     PAGE 2

OBTAINING A NUMBER

If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card (for
individuals), Form W-7, Applicantion for an ITIN (for individuals who are not
eligible to obtain an SSN but who must furnish a TIN), or Form SS-4, Application
for Employer Identification Number (for businesses and all other entities), at
the local office of the Social Security Administration or the Internal Revenue
Service and apply for a number.

PAYEES EXEMPT FROM BACKUP WITHHOLDING

The following is a list of payees specifically exempted from backup withholding
depending upon the type of payment (see below):

  (1)  A corporation.
  (2)  An organization exempt from tax under section 501(a), or an IRA, or a
       custodial account under section 403(b)(7), if the account satisfies the
       requirements of section 401(f)(2).
  (3)  The United States or any agency or instrumentality thereof.
  (4)  A State, the District of Columbia, a possession of the United States, or
       any subdivision or instrumentality thereof.
  (5)  A foreign government, a political subdivision of a foreign government, or
       any agency or instrumentality thereof.
  (6)  An international organization or any agency or instrumentality thereof.
  (7)  A foreign central bank of issue.
  (8)  A dealer in securities or commodities required to register in the United
       States, the District of Columbia, or a possession of the United States.
  (9)  A futures commission merchant registered with the Commodity Futures
       Trading Commission.
  (10) A real estate investment trust.
  (11) An entity registered at all times during the tax year under the
       Investment Company Act of 1940.
  (12) A common trust fund operated by a bank under section 584(a).
  (13) A financial institution.
  (14) A middleman known in the investment community as a nominee or listed in
       the most recent publication of the American Society of Corporate
       Secretaries, Inc., Nominee List.
  (15) A trust exempt from tax under section 664 or described in section 4947.
For interest and dividends, all listed payees are exempt except item (9). For
broker transactions, payees listed in items (1) through (13) and a person
registered under the Investment Advisers Act of 1940 who regularly acts as a
broker are exempt.

Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" IN PART II OF THE FORM, AND RETURN IT TO
THE PAYER. If you are a nonresident alien or a foreign entity not subject to
backup withholding, give the payer a completed Form W-8BEN Certificate of
Foreign Status of Beneficial owner for United States Tax Withholding.

PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers of payers
who must report the payments to the IRS. The IRS uses the numbers for
identification purposes. Payers must be given the numbers whether or not
recipients are required to file tax returns. Payers must generally withhold 31
percent of taxable interest, dividend, and certain other payments to a payee who
does not furnish a taxpayer identification number to a payer. Certain penalties
may also apply.

PENALTIES

(1) FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.--If you fail to furnish
your correct taxpayer identification number to a payer, you are subject to a
penalty of $50 for each such failure unless your failure is due to reasonable
cause and not to willful neglect.

(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.

(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION.--Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.

                  FOR ADDITIONAL INFORMATION CONTACT YOUR TAX
                  CONSULTANT OR THE INTERNAL REVENUE SERVICE.

<PAGE>   1
For Immediate Release


                      GRUPO SANBORNS COMMENCES TENDER OFFER
                           FOR SHARES OF COMPUSA, INC.

         Grupo Sanborns, S.A. de C.V. announced today that its wholly-owned
subsidiary, TPC Acquisition Corp., has commenced its previously announced tender
offer for all of the outstanding shares of CompUSA , Inc. (NYSE: CPU) not owned
by Grupo Sanborns or its affiliates for $10.10 per share in cash. The tender
offer is being conducted pursuant to a Merger Agreement dated January 23, 2000.
The tender offer is scheduled to expire at 12:00 midnight, eastern standard
time, on Tuesday, February 29, 2000, unless extended.

         The Board of Directors of CompUSA unanimously approved the Merger
Agreement and recommends that shareholders of CompUSA accept the tender offer
and tender their shares pursuant to the tender offer.

         The tender offer is conditioned upon, among other things, there being
validly tendered and not withdrawn a number of CompUSA shares, which together
with any shares beneficially owned by Grupo Sanborns and its affiliates,
represents at least two-thirds of the outstanding CompUSA shares on a fully
diluted basis at the expiration of the offer, termination or expiration of the
waiting period under the Hart-Scott-Rodino Act and satisfaction of certain other
conditions. The complete terms and conditions of the offer are set forth in the
Offer to Purchase, Letter of Transmittal and other related materials being filed
today with the Securities and Exchange Commission. Copies of the Offer to
Purchase and the CompUSA Solicitation/Recommendation Statement on Schedule
14D-9, also filed today with the SEC, are available from MacKenzie Partners,
Inc., the information agent for the offer. Citibank, N.A. is acting as
depositary for the offer.

         Grupo Sanborns has one of the strongest retail brand portfolios in
Mexico. It owns and operates 305 stores in major cities across Mexico, including
Sanborns, Sanborns Cafe, Sears Roebuck de Mexico, Pasteleria el Globo, Mix-up
and Discolandia. Grupo Sanborns also produces food and manufactures
household/personal care items sold throughout Mexico. The group's e-commerce
initiatives include a shopping portal for Sanborns products. Grupo Sanborns has
over 30,000 employees.

         CompUSA Inc. is one of the nation's leading retailers and resellers of
personal computers and related products and services. CompUSA currently operates
217 CompUSA Computer Superstores in 84 major metropolitan markets across the
United States that serve retail, corporate, government and education customers
and include technical service departments. Many of the stores also include
classroom training facilities. CompUSA offers its own build-to-order personal
computer series, the CompUSA PC(TM). CompUSA has over 20,000 employees.


<PAGE>   2
Contacts:

For Grupo Sanborns:                 Carlos Slim Domit  or     Javier Larraza
                                    Grupo Sanborns            Grupo Sanborns
                                    011-525-325-9800          011-525-625-4900

For CompUSA:                        James E. Skinner   or     Stacie Shirley
                                    CompUSA                   CompUSA
                                    972-982-4000              972-453-2305

                                                              #  #  #

<PAGE>   1
This announcement is neither an offer to purchase nor a solicitation of an offer
to sell Shares (as defined below). The Offer (as defined below) is made solely
by the Offer to Purchase, dated February 1, 2000, and the related Letter of
Transmittal and any amendments or supplements thereto, and is being made to all
holders of Shares except for Parent and Purchaser (as defined below). The Offer
is not being made to (nor will tenders be accepted from or on behalf of) holders
of Shares in any jurisdiction in which the making of the Offer or the acceptance
thereof would not be in compliance with the laws of such jurisdiction. In any
jurisdiction where the securities, blue sky or other laws require the Offer to
be made by a licensed broker or dealer, the Offer will be deemed to be made on
behalf of Purchaser by one or more registered brokers or dealers that are
licensed under the laws of such jurisdiction.

                      Notice of Offer to Purchase for Cash

                     All Outstanding Shares of Common Stock
           (including the Associated Rights to Purchase Common Stock)
                                       of
                                  CompUSA Inc.
                                       at
                              $10.10 Net Per Share
                                       by
                             TPC Acquisition Corp.
                          a wholly owned subsidiary of
                          Grupo Sanborns, S.A. de C.V.

TPC Acquisition Corp., a Delaware corporation ("Purchaser") and a wholly owned
subsidiary of Grupo Sanborns, S.A. de C.V., a corporation organized under the
laws of the United Mexican States ("Parent"), is offering to purchase all
outstanding shares of common stock, par value $.01 per share, of CompUSA Inc., a
Delaware corporation (the "Company"), including the associated common stock
purchase rights issued pursuant to the Rights Agreement (the "Rights
Agreement"), dated as of April 29, 1994, as amended as of January 23, 2000,
between the Company and American Stock Transfer & Trust Company (formerly Bank
One, Texas, N.A.), as Rights Agent (the "Shares"), at $10.10 per Share, net to
the seller in cash, without interest, upon the terms and subject to the
conditions set forth in the Offer to Purchase, dated February 1, 2000, and in
the related Letter of Transmittal (which, together with any amendments or
supplements thereto, together constitute the "Offer"), except for Shares owned
by Parent, Purchaser or any of their respective affiliates. Tendering
shareholders will not be obligated to pay brokerage fees or commissions or,
except as set forth in Instruction 6 of the Letter of Transmittal, transfer
taxes on the purchase of Shares by Purchaser pursuant to the Offer. The purpose
of the Offer is to acquire for cash as many outstanding Shares as possible as a
first step in acquiring the entire equity interest in the Company. Following the
consummation of the Offer, Purchaser intends to effect the Merger (as defined
below).

The Offer is conditioned upon, among other things, (1) there being validly
tendered and not withdrawn prior to the expiration of the Offer that number of
Shares that, together with any Shares then beneficially owned by Parent or
Purchaser or any of their respective affiliates, represents at least two-thirds
of the issued and outstanding Shares on a fully diluted basis and (2) any
waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended, and the regulations thereunder applicable to the purchase of Shares
pursuant to the Offer having expired or been terminated prior to the expiration
of the Offer. Certain other conditions to the Offer are described in Section 14
of the Offer to Purchase. The Offer is being made pursuant to a Merger Agreement
(the "Merger Agreement"), dated as of January 23, 2000, among the Company,
Parent and Purchaser, pursuant to which, after completion of the Offer and the
satisfaction or waiver of certain conditions, Purchaser will be merged with and
into the Company and the Company will be the surviving corporation (the
"Merger") and each issued and outstanding Share (other than Shares owned by
Parent, Purchaser or any subsidiary or affiliate of Parent, Purchaser or the
Company or held in the treasury of the Company or Shares which are held by
shareholders who properly exercise dissenters' rights, if any) will, by virtue
of the Merger and without any action on the part of the holder thereof, be
canceled and converted into the right to receive an amount in cash, without
interest, equal to the per Share price paid pursuant to the Offer. The Merger
Agreement is more fully described in the Offer to Purchase. The Company has
amended the Rights Agreement to make
<PAGE>   2
the Rights Agreement inapplicable to the Offer, the Merger and the Merger
Agreement.

The Board of Directors of the Company has unanimously approved the Merger
Agreement, the Offer and the Merger, determined that the Offer and the Merger
are advisable and fair to, and in the best interests of, the holders of Shares
(other than Parent and its affiliates) and unanimously recommends that
shareholders accept the Offer and tender their Shares pursuant to the Offer. For
purposes of the Offer, Purchaser will be deemed to have accepted for payment,
and thereby purchased, Shares validly tendered and not properly withdrawn if and
when Purchaser gives oral or written notice to Citibank, N.A. (the "Depositary")
of its acceptance for payment of such Shares pursuant to the Offer. Upon the
terms and subject to the conditions of the Offer, payment for Shares accepted
for payment pursuant to the Offer will be made by deposit of the purchase price
therefor with the Depositary, which will act as agent for the tendering
shareholders for the purpose of receiving payments from Purchaser and
transmitting such payments to the tendering shareholders. Under no circumstances
will interest be paid on the purchase price for Shares, regardless of any
extension of the Offer or any delay in making such payment.

In all cases, payment for Shares tendered and accepted for payment pursuant to
the Offer will be made only after timely receipt by the Depositary of (a)
certificates for such Shares or confirmation of the book-entry transfer of such
Shares into the Depositary's account at The Depository Trust Company (the
"Book-Entry Transfer Facility") pursuant to the procedures set forth in Section
3 of the Offer to Purchase, (b) a Letter of Transmittal (or facsimile thereof),
properly completed and duly executed, with any required signature guarantees
(or, in the case of a book-entry transfer, an Agent's Message (as defined in
Section 3 of the Offer to Purchase) in lieu of the Letter of Transmittal) and
(c) any other documents required by the Letter of Transmittal.

Tenders of Shares made pursuant to the Offer are irrevocable, except that Shares
tendered pursuant to the Offer may be withdrawn at any time prior to the
Expiration Date as defined below and, unless theretofore accepted for payment by
Purchaser pursuant to the Offer, may also be withdrawn at any time after April
1, 2000, except as provided with respect to any subsequent offering period. The
term "Expiration Date" means 12:00 midnight, New York City time, on Tuesday,
February 29, 2000, unless Purchaser, in its sole discretion (subject to the
terms of the Merger Agreement), shall have extended the period of time during
which the Offer is open, in which event the term "Expiration Date" shall mean
the latest time and date on which the Offer, as so extended by Purchaser, shall
expire. Subject to the terms of the Merger Agreement and the applicable rules
and regulations of the Securities and Exchange Commission, Purchaser expressly
reserves the right (but will not be obligated), in its sole discretion, at any
time or from time to time, to extend the period of time during which the Offer
is open by giving oral or written notice of such extension to the Depositary.
Any such extension will be followed as promptly as practicable by public
announcement thereof, such announcement to be issued no later than 9:00 a.m.,
New York City time, on the next business day after the previously scheduled
Expiration Date. During any such extension, all Shares previously tendered and
not withdrawn will remain subject to the Offer, subject to the right of a
tendering shareholder to withdraw such shareholder's Shares.

For a withdrawal to be effective, a written or facsimile transmission notice of
withdrawal must be timely received by the Depositary at one of its addresses set
forth on the back cover of the Offer to Purchase. Any such notice of withdrawal
must specify the name of the person having tendered the Shares to be withdrawn,
the number of Shares to be withdrawn and (if certificates for such Shares have
been tendered) the names in which the certificate(s) evidencing the Shares to be
withdrawn are registered, if different from that of the person who tendered such
Shares. The signature(s) on the notice of withdrawal must be guaranteed by an
Eligible Institution (as defined in Section 3 of the Offer to Purchase), unless
such Shares have been tendered for the account of any Eligible Institution. If
Shares have been tendered pursuant to the procedures for book-entry transfer as
set forth in Section 3 of the Offer to Purchase, any notice of withdrawal must
specify the name and number of the account at the Book-Entry Transfer Facility
to be credited with the withdrawn Shares and otherwise comply with the
Book-Entry Transfer Facility's procedures. If certificates for Shares to be
withdrawn have been delivered or otherwise identified to the Depositary, the
name of the registered holder and the serial numbers shown on such certificates
must also be furnished to the Depositary as aforesaid prior to the physical
release of such
<PAGE>   3
certificates. All questions as to the form and validity (including time of
receipt) of any notice of withdrawal will be determined by Purchaser, in its
sole discretion, which determination shall be final and binding. None of Parent,
Purchaser, the Depositary, the Information Agent (listed below), or any other
person will be under any duty to give notification of any defects or
irregularities in any notice of withdrawal or incur any liability for failure to
give such notification. Withdrawals of tenders of Shares may not be rescinded,
and any Shares properly withdrawn will be deemed not to have been validly
tendered for purposes of the Offer. However, withdrawn Shares may be retendered
by following one of the procedures described in Section 3 of the Offer to
Purchase at any time prior to the Expiration Date. Under the Merger Agreement
and pursuant to Rule 14d-11 of the General Rules and Regulations under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), Purchaser may,
subject to certain conditions, include a subsequent offering period following
the Expiration Date. Purchaser does not currently intend to include a subsequent
offering period in the Offer, although it reserves the right to do so in its
sole discretion. Under the Exchange Act, no withdrawal rights apply to Shares
tendered during a subsequent offering period and no withdrawal rights apply
during the subsequent offering period with respect to Shares tendered in the
Offer and accepted for payment. See Section 1 of the Offer to Purchase.

The information required to be disclosed by paragraph (d)(1) of Rule 14d-6 of
the General Rules and Regulations under the Exchange Act is contained in the
Offer to Purchase and is incorporated herein by reference.

The Company has provided Purchaser with the Company's list of stockholders and
security position listings for the purpose of disseminating the Offer to holders
of Shares. The Offer to Purchase and the related Letter of Transmittal will be
mailed by Purchaser to record holders of Shares whose names appear on the
Company's stockholders list and will be furnished to brokers, dealers,
commercial banks, trust companies and similar persons whose names, or the names
of whose nominees, appear on the stockholder list or, if applicable, who are
listed as participants in a clearing agency's security position listing for
subsequent transmittal to beneficial owners of Shares.

The Offer to Purchase and the related Letter of Transmittal contain important
information which should be read carefully and in their entirety before any
decision is made with respect to the Offer. Questions and requests for
assistance may be directed to the Information Agent at the address and telephone
number set forth below. Requests for additional copies of the Offer to Purchase
and the related Letter of Transmittal may be directed to the Information Agent
or to brokers, dealers, commercial banks or trust companies. Such additional
copies will be furnished at Purchaser's expense. Purchaser will not pay any fees
or commissions to any broker or dealer or any other person (other than the
Information Agent) for soliciting tenders of Shares pursuant to the Offer.

The Information Agent for the Offer Is:

                          [MACKENZIE PARTNERS, INC.]

                               156 Fifth Avenue
                           New York, New York 10010
                Banks and brokers call collect: (212) 929-5500
                                       or
                   All others call toll-free (800) 322-2885

February 1, 2000

<PAGE>   1


                        AMENDMENT TO EMPLOYMENT AGREEMENT
                        ---------------------------------

                  This Amendment to Employment Agreement (this "Amendment") is
executed between the undersigned parties as of January 23, 2000.

                  WHEREAS, CompUSA, Inc., a Delaware corporation (the
"Employer"), and Harold F. Compton (the "Employee") have entered into an
Employment Agreement, dated August 16, 1996 (the "Agreement"), which provides,
among other things, for certain "Termination Payments" and "Gross Up Payments"
(each as defined in the Agreement) to be paid to Employee upon the occurrence of
certain events; and

                  WHEREAS, the Employee and the Employer desire to amend the
Agreement to provide that the Termination Payments and the Gross Up Payments
shall be paid in two installments as provided herein.

                  NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the parties hereto,
the parties hereto hereby agree to amend the Agreement as follows.

                  1. Defined Terms. Except as hereinafter provided, all defined
terms used herein that are not otherwise defined herein shall have the meaning
ascribed to such terms in the Agreement. As used herein, the term "Cause" has
the meaning ascribed to such term in Section 6(a)(ii) of the Agreement, without
regard to any other provision therein. As used herein, the term "Termination
Payment" has the meaning ascribed to such term in Section 10(b)(i) of the
Agreement, excluding the amounts described in clauses (I), (II) and (III) of
Section 10(b)(i)(2) thereof. In addition, the Employee's employment hereunder
shall be "Constructively Terminated" if the Employer (i) demotes the Employee to
a lesser position, either in title or responsibility, than the position the
Employee held immediately prior to the Change in Control, (ii) decreases the
Employee's base salary below the base salary that was in effect immediately
prior to the Change in Control or (iii) requires the Employee to relocate to a
principal place of business more than twenty-five miles from the principal place
of business occupied by the Employer on the date hereof.

                  2. Installment Payments. (a) Notwithstanding any provision to
the contrary in the Agreement, including, without limitation, the provisions of
Section 10 thereof, the Termination Payment and the Gross Up Payment shall be
paid in two installments. The first installment shall be equal to the sum of (i)
eighty percent (80%) of the Termination Payment and (ii) the Gross Up Payment to
which the Employee would be entitled pursuant to the Agreement if the amount of
the Termination Payment were reduced by twenty percent (20%). Such first
installment shall be paid on the date on which the Termination Payment and the
Gross Up Payment would be required to be paid pursuant to the Agreement, without
regard to this Amendment (the "First Payment Date"). The second installment (the
"Deferred Payment") shall be equal to the sum of (i) the remaining twenty
percent (20%) of the Termination Payment and (ii) the excess of (A) the Gross Up
Payment (calculated in accordance with the Agreement and based on the full
amount of the Termination Payment) over (B) the amount determined pursuant to
clause (ii) of the preceding sentence of this Section 2(a). The Deferred Payment
shall be paid on the earlier to occur of (i) the three-month anniversary of the
First Payment Date, if the
<PAGE>   2
employee is employed by the Employer at such time and (ii) two (2) business days
after the date on which the Employee's employment with the Employer terminates
for any reason other than by the Employer for Cause or the voluntary resignation
of the Employee. If the employment of the Employee is terminated prior to the
three-month anniversary of the First Payment Date by the Employer for Cause or
by the voluntary resignation of the Employee, then the Deferred Payment shall be
irrevocably forfeited without any additional action by the Employer. It is
understood that in the event that the Employee's employment is Constructively
Terminated by the Employer, such termination shall not be considered a voluntary
resignation by the Employee.

                  (b) In addition to the payments under the preceding
subparagraph (a) of this Section 2, on the First Payment Date, the Employer
shall deposit an amount equal to the Deferred Payment into an interest bearing
escrow account (designated by the Employer) for the benefit of the Employee. In
the event the Employer pays the Deferred Payment to the Employee as provided in
subparagraph (a) of this Section 2, the Employee shall also be entitled to the
interest earned on the amount of the Deferred Payment deposited in such escrow
account, in lieu of any interest payments that the Employee may otherwise have
been entitled to under Section 10(b)(ii) of the Agreement.

                  (c) Notwithstanding any provision in the Agreement to the
contrary, including without limitation an Agreement Termination, the Employee
agrees to render services to the Employer as an employee on a full-time basis
during the six-month period commencing on the First Payment Date. In
consideration for such services, the Employee shall be entitled to base salary
at a rate equal to one hundred percent (100%) of his rate of "annualized base
compensation" within the meaning of Section 10(b)(i)(1)(I) of the Agreement,
plus such vacation, insurance, car allowance and health club membership benefits
as are now provided under Section 4 of the Agreement. The Employee shall not be
entitled to any additional benefit in the nature of severance pay upon the
termination of such employment, other than the Deferred Payment, subject to the
conditions provided above.

                  3. Incorporation. Except as expressly provided in this
Amendment, the Agreement shall remain in full force and effect. The provisions
of this Amendment shall be deemed to be a part of the Agreement as if included
therein. Nothing in this Amendment is intended to revise the provisions relating
to the determination and potential adjustment of the Gross Up Payment as
provided in Section 10 of the Agreement, and the Gross Up Payment portions of
the installment payments described herein are subject to such determination and
potential adjustment provisions. In addition, nothing in this Amendment is
intended to affect the Employee's entitlement to the payments described in
Section 10(b)(i)(2)(I), (II) and (III) of the Agreement.



                                       2
<PAGE>   3
                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the 23 day of January, 2000.


                                            CompUSA Inc.


                                            By: /s/ James F. Halpin
                                               --------------------------------
                                            Name:    James F. Halpin
                                             Title:  President and CEO


                                            EMPLOYEE

                                               /s/ Harold F. Compton
                                               --------------------------------


                                       3
<PAGE>   4
                        AMENDMENT TO EMPLOYMENT AGREEMENT
                        ---------------------------------

                  This Amendment to Employment Agreement (this "Amendment") is
executed between the undersigned parties as of January 23, 2000.

                  WHEREAS, CompUSA, Inc., a Delaware corporation (the
"Employer"), and J. Samuel Crowley (the "Employee") have entered into an
Employment Agreement, dated May 11, 1998 (the "Agreement"), which provides,
among other things, for certain "Termination Payments" and "Gross Up Payments"
(each as defined in the Agreement) to be paid to Employee upon the occurrence of
certain events; and

                  WHEREAS, the Employee and the Employer desire to amend the
Agreement to provide that the Termination Payments and the Gross Up Payments
shall be paid in two installments as provided herein.

                  NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the parties hereto,
the parties hereto hereby agree to amend the Agreement as follows.

                  1. Defined Terms. Except as hereinafter provided, all defined
terms used herein that are not otherwise defined herein shall have the meaning
ascribed to such terms in the Agreement. As used herein, the term "Cause" has
the meaning ascribed to such term in Section 6(a)(ii) of the Agreement, without
regard to any other provision therein. As used herein, the term "Termination
Payment" has the meaning ascribed to such term in Section 10(b)(i) of the
Agreement, excluding the amounts described in clauses (I), (II) and (III) of
Section 10(b)(i)(2) thereof. In addition, the Employee's employment hereunder
shall be "Constructively Terminated" if the Employer (i) demotes the Employee to
a lesser position, either in title or responsibility, than the position the
Employee held immediately prior to the Change in Control, (ii) decreases the
Employee's base salary below the base salary that was in effect immediately
prior to the Change in Control or (iii) requires the Employee to relocate to a
principal place of business more than twenty-five miles from the principal place
of business occupied by the Employer on the date hereof.

                  2. Installment Payments. (a) Notwithstanding any provision to
the contrary in the Agreement, including, without limitation, the provisions of
Section 10 thereof, the Termination Payment and the Gross Up Payment shall be
paid in two installments. The first installment shall be equal to the sum of (i)
eighty percent (80%) of the Termination Payment and (ii) the Gross Up Payment to
which the Employee would be entitled pursuant to the Agreement if the amount of
the Termination Payment were reduced by twenty percent (20%). Such first
installment shall be paid on the date on which the Termination Payment and the
Gross Up Payment would be required to be paid pursuant to the Agreement, without
regard to this Amendment (the "First Payment Date"). The second installment (the
"Deferred Payment") shall be equal to the sum of (i) the remaining twenty
percent (20%) of the Termination Payment and (ii) the excess of (A) the Gross Up
Payment (calculated in accordance with the Agreement and based on the full
amount of the Termination Payment) over (B) the amount determined pursuant to
clause (ii) of the preceding sentence of this Section 2(a). The Deferred Payment
shall be paid on the earlier to occur of (i) the three-month anniversary of the
First Payment Date, if the
<PAGE>   5
employee is employed by the Employer at such time and (ii) two (2) business days
after the date on which the Employee's employment with the Employer terminates
for any reason other than by the Employer for Cause or the voluntary resignation
of the Employee. If the employment of the Employee is terminated prior to the
three-month anniversary of the First Payment Date by the Employer for Cause or
by the voluntary resignation of the Employee, then the Deferred Payment shall be
irrevocably forfeited without any additional action by the Employer. It is
understood that in the event that the Employee's employment is Constructively
Terminated by the Employer, such termination shall not be considered a voluntary
resignation by the Employee.

                  (b) In addition to the payments under the preceding
subparagraph (a) of this Section 2, on the First Payment Date, the Employer
shall deposit an amount equal to the Deferred Payment into an interest bearing
escrow account (designated by the Employer) for the benefit of the Employee. In
the event the Employer pays the Deferred Payment to the Employee as provided in
subparagraph (a) of this Section 2, the Employee shall also be entitled to the
interest earned on the amount of the Deferred Payment deposited in such escrow
account, in lieu of any interest payments that the Employee may otherwise have
been entitled to under Section 10(b)(ii) of the Agreement.

                  (c) Notwithstanding any provision in the Agreement to the
contrary, including without limitation an Agreement Termination, the Employee
agrees to render services to the Employer as an employee on a full-time basis
during the six-month period commencing on the First Payment Date. In
consideration for such services, the Employee shall be entitled to base salary
at a rate equal to one hundred percent (100%) of his rate of "annualized base
compensation" within the meaning of Section 10(b)(i)(1)(I) of the Agreement,
plus such vacation, insurance, car allowance and health club membership benefits
as are now provided under Section 4 of the Agreement. The Employee shall not be
entitled to any additional benefit in the nature of severance pay upon the
termination of such employment, other than the Deferred Payment, subject to the
conditions provided above.

                  3. Incorporation. Except as expressly provided in this
Amendment, the Agreement shall remain in full force and effect. The provisions
of this Amendment shall be deemed to be a part of the Agreement as if included
therein. Nothing in this Amendment is intended to revise the provisions relating
to the determination and potential adjustment of the Gross Up Payment as
provided in Section 10 of the Agreement, and the Gross Up Payment portions of
the installment payments described herein are subject to such determination and
potential adjustment provisions. In addition, nothing in this Amendment is
intended to affect the Employee's entitlement to the payments described in
Section 10(b)(i)(2)(I), (II) and (III) of the Agreement.

                                       2
<PAGE>   6
                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the 23 day of January, 2000.


                                      CompUSA Inc.


                                      By: /s/ James F. Halpin
                                          --------------------------------
                                      Name:    James F. Halpin
                                       Title:  President and CEO


                                      EMPLOYEE


                                          /s/ J. Samuel Crowley
                                          --------------------------------

                                       3
<PAGE>   7
                        AMENDMENT TO EMPLOYMENT AGREEMENT
                        ---------------------------------

                  This Amendment to Employment Agreement (this "Amendment") is
executed between the undersigned parties as of January 23, 2000.

                  WHEREAS, CompUSA, Inc., a Delaware corporation (the
"Employer"), and James F. Halpin (the "Employee") have entered into an
Employment Agreement, dated August 16, 1996 (the "Agreement"), which provides,
among other things, for certain "Termination Payments" and "Gross Up Payments"
(each as defined in the Agreement) to be paid to Employee upon the occurrence of
certain events; and

                  WHEREAS, the Employee and the Employer desire to amend the
Agreement to provide that the Termination Payments and the Gross Up Payments
shall be paid in two installments as provided herein.

                  NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the parties hereto,
the parties hereto hereby agree to amend the Agreement as follows.

                  1. Defined Terms. Except as hereinafter provided, all defined
terms used herein that are not otherwise defined herein shall have the meaning
ascribed to such terms in the Agreement. As used herein, the term "Cause" has
the meaning ascribed to such term in Section 6(a)(ii) of the Agreement, without
regard to any other provision therein. As used herein, the term "Termination
Payment" has the meaning ascribed to such term in Section 10(b)(i) of the
Agreement, excluding the amounts described in clauses (I), (II) and (III) of
Section 10(b)(i)(2) thereof. In addition, the Employee's employment hereunder
shall be "Constructively Terminated" if the Employer (i) demotes the Employee to
a lesser position, either in title or responsibility, than the position the
Employee held immediately prior to the Change in Control, (ii) decreases the
Employee's base salary below the base salary that was in effect immediately
prior to the Change in Control or (iii) requires the Employee to relocate to a
principal place of business more than twenty-five miles from the principal place
of business occupied by the Employer on the date hereof.

                  2. Installment Payments. (a) Notwithstanding any provision to
the contrary in the Agreement, including, without limitation, the provisions of
Section 10 thereof, the Termination Payment and the Gross Up Payment shall be
paid in two installments. The first installment shall be equal to the sum of (i)
eighty percent (80%) of the Termination Payment and (ii) the Gross Up Payment to
which the Employee would be entitled pursuant to the Agreement if the amount of
the Termination Payment were reduced by twenty percent (20%). Such first
installment shall be paid on the date on which the Termination Payment and the
Gross Up Payment would be required to be paid pursuant to the Agreement, without
regard to this Amendment (the "First Payment Date"). The second installment (the
"Deferred Payment") shall be equal to the sum of (i) the remaining twenty
percent (20%) of the Termination Payment and (ii) the excess of (A) the Gross Up
Payment (calculated in accordance with the Agreement and based on the full
amount of the Termination Payment) over (B) the amount determined pursuant to
clause (ii) of the preceding sentence of this Section 2(a). The Deferred Payment
shall be paid on the earlier to occur of (i) the three-month anniversary of the
First Payment Date, if the
<PAGE>   8
employee is employed by the Employer at such time and (ii) two (2) business days
after the date on which the Employee's employment with the Employer terminates
for any reason other than by the Employer for Cause or the voluntary resignation
of the Employee. If the employment of the Employee is terminated prior to the
three-month anniversary of the First Payment Date by the Employer for Cause or
by the voluntary resignation of the Employee, then the Deferred Payment shall be
irrevocably forfeited without any additional action by the Employer. It is
understood that in the event that the Employee's employment is Constructively
Terminated by the Employer, such termination shall not be considered a voluntary
resignation by the Employee.

                  (b) In addition to the payments under the preceding
subparagraph (a) of this Section 2, on the First Payment Date, the Employer
shall deposit an amount equal to the Deferred Payment into an interest bearing
escrow account (designated by the Employer) for the benefit of the Employee. In
the event the Employer pays the Deferred Payment to the Employee as provided in
subparagraph (a) of this Section 2, the Employee shall also be entitled to the
interest earned on the amount of the Deferred Payment deposited in such escrow
account, in lieu of any interest payments that the Employee may otherwise have
been entitled to under Section 10(b)(ii) of the Agreement.

                  (c) Notwithstanding any provision in the Agreement to the
contrary, including without limitation an Agreement Termination, the Employee
agrees to render services to the Employer as an employee on a full-time basis
during the six-month period commencing on the First Payment Date. In
consideration for such services, the Employee shall be entitled to base salary
at a rate equal to one hundred percent (100%) of his rate of "annualized base
compensation" within the meaning of Section 10(b)(i)(1)(I) of the Agreement,
plus such vacation, insurance, car allowance and health club membership benefits
as are now provided under Section 4 of the Agreement. The Employee shall not be
entitled to any additional benefit in the nature of severance pay upon the
termination of such employment, other than the Deferred Payment, subject to the
conditions provided above.

                  3. Incorporation. Except as expressly provided in this
Amendment, the Agreement shall remain in full force and effect. The provisions
of this Amendment shall be deemed to be a part of the Agreement as if included
therein. Nothing in this Amendment is intended to revise the provisions relating
to the determination and potential adjustment of the Gross Up Payment as
provided in Section 10 of the Agreement, and the Gross Up Payment portions of
the installment payments described herein are subject to such determination and
potential adjustment provisions. In addition, nothing in this Amendment is
intended to affect the Employee's entitlement to the payments described in
Section 10(b)(i)(2)(I), (II) and (III) of the Agreement.

                                       2
<PAGE>   9
                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the 23 day of January, 2000.


                                             CompUSA Inc.


                                             By: /s/ James E. Skinner
                                                -------------------------------
                                             Name:    James E. Skinner
                                              Title:  Executive Vice President


                                             EMPLOYEE


                                             /s/ James F. Halpin
                                             --------------------------------

                                       3
<PAGE>   10
                        AMENDMENT TO EMPLOYMENT AGREEMENT
                        ---------------------------------

                  This Amendment to Employment Agreement (this "Amendment") is
executed between the undersigned parties as of January 23, 2000.

                  WHEREAS, CompUSA, Inc., a Delaware corporation (the
"Employer"), and Lawrence N. Mondry (the "Employee") have entered into an
Employment Agreement, dated May 11, 1998 (the "Agreement"), which provides,
among other things, for certain "Termination Payments" and "Gross Up Payments"
(each as defined in the Agreement) to be paid to Employee upon the occurrence of
certain events; and

                  WHEREAS, the Employee and the Employer desire to amend the
Agreement to provide that the Termination Payments and the Gross Up Payments
shall be paid in two installments as provided herein.

                  NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the parties hereto,
the parties hereto hereby agree to amend the Agreement as follows.

                  1. Defined Terms. Except as hereinafter provided, all defined
terms used herein that are not otherwise defined herein shall have the meaning
ascribed to such terms in the Agreement. As used herein, the term "Cause" has
the meaning ascribed to such term in Section 6(a)(ii) of the Agreement, without
regard to any other provision therein. As used herein, the term "Termination
Payment" has the meaning ascribed to such term in Section 10(b)(i) of the
Agreement, excluding the amounts described in clauses (I), (II) and (III) of
Section 10(b)(i)(2) thereof. In addition, the Employee's employment hereunder
shall be "Constructively Terminated" if the Employer (i) demotes the Employee to
a lesser position, either in title or responsibility, than the position the
Employee held immediately prior to the Change in Control, (ii) decreases the
Employee's base salary below the base salary that was in effect immediately
prior to the Change in Control or (iii) requires the Employee to relocate to a
principal place of business more than twenty-five miles from the principal place
of business occupied by the Employer on the date hereof.

                  2. Installment Payments. (a) Notwithstanding any provision to
the contrary in the Agreement, including, without limitation, the provisions of
Section 10 thereof, the Termination Payment and the Gross Up Payment shall be
paid in two installments. The first installment shall be equal to the sum of (i)
eighty percent (80%) of the Termination Payment and (ii) the Gross Up Payment to
which the Employee would be entitled pursuant to the Agreement if the amount of
the Termination Payment were reduced by twenty percent (20%). Such first
installment shall be paid on the date on which the Termination Payment and the
Gross Up Payment would be required to be paid pursuant to the Agreement, without
regard to this Amendment (the "First Payment Date"). The second installment (the
"Deferred Payment") shall be equal to the sum of (i) the remaining twenty
percent (20%) of the Termination Payment and (ii) the excess of (A) the Gross Up
Payment (calculated in accordance with the Agreement and based on the full
amount of the Termination Payment) over (B) the amount determined pursuant to
clause (ii) of the preceding sentence of this Section 2(a). The Deferred Payment
shall be paid on the earlier to occur of (i) the three-month anniversary of the
First Payment Date, if the
<PAGE>   11
employee is employed by the Employer at such time and (ii) two (2) business days
after the date on which the Employee's employment with the Employer terminates
for any reason other than by the Employer for Cause or the voluntary resignation
of the Employee. If the employment of the Employee is terminated prior to the
three-month anniversary of the First Payment Date by the Employer for Cause or
by the voluntary resignation of the Employee, then the Deferred Payment shall be
irrevocably forfeited without any additional action by the Employer. It is
understood that in the event that the Employee's employment is Constructively
Terminated by the Employer, such termination shall not be considered a voluntary
resignation by the Employee.

                  (b) In addition to the payments under the preceding
subparagraph (a) of this Section 2, on the First Payment Date, the Employer
shall deposit an amount equal to the Deferred Payment into an interest bearing
escrow account (designated by the Employer) for the benefit of the Employee. In
the event the Employer pays the Deferred Payment to the Employee as provided in
subparagraph (a) of this Section 2, the Employee shall also be entitled to the
interest earned on the amount of the Deferred Payment deposited in such escrow
account, in lieu of any interest payments that the Employee may otherwise have
been entitled to under Section 10(b)(ii) of the Agreement.

                  (c) Notwithstanding any provision in the Agreement to the
contrary, including without limitation an Agreement Termination, the Employee
agrees to render services to the Employer as an employee on a full-time basis
during the six-month period commencing on the First Payment Date. In
consideration for such services, the Employee shall be entitled to base salary
at a rate equal to one hundred percent (100%) of his rate of "annualized base
compensation" within the meaning of Section 10(b)(i)(1)(I) of the Agreement,
plus such vacation, insurance, car allowance and health club membership benefits
as are now provided under Section 4 of the Agreement. The Employee shall not be
entitled to any additional benefit in the nature of severance pay upon the
termination of such employment, other than the Deferred Payment, subject to the
conditions provided above.

                  3. Incorporation. Except as expressly provided in this
Amendment, the Agreement shall remain in full force and effect. The provisions
of this Amendment shall be deemed to be a part of the Agreement as if included
therein. Nothing in this Amendment is intended to revise the provisions relating
to the determination and potential adjustment of the Gross Up Payment as
provided in Section 10 of the Agreement, and the Gross Up Payment portions of
the installment payments described herein are subject to such determination and
potential adjustment provisions. In addition, nothing in this Amendment is
intended to affect the Employee's entitlement to the payments described in
Section 10(b)(i)(2)(I), (II) and (III) of the Agreement.

                                       2
<PAGE>   12
                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the 23 day of January, 2000.


                                            CompUSA Inc.


                                            By:/s/ James F. Halpin
                                               --------------------------------
                                            Name:    James F. Halpin
                                             Title:  President and CEO


                                            EMPLOYEE


                                            /s/ Lawrence N. Mondry
                                            --------------------------------


                                       3
<PAGE>   13
                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------

                  This Amendment to Employment Agreement (this "Amendment") is
executed between the undersigned parties as of January 23, 2000.

                  WHEREAS, CompUSA, Inc., a Delaware corporation (the
"Employer"), and James Edward Skinner (the "Employee") have entered into an
Employment Agreement, dated May 1, 1998 (the "Agreement"), which provides, among
other things, for certain "Termination Payments" and "Gross Up Payments" (each
as defined in the Agreement) to be paid to Employee upon the occurrence of
certain events; and

                  WHEREAS, the Employee and the Employer desire to amend the
Agreement to provide that the Termination Payments and the Gross Up Payments
shall be paid in two installments as provided herein.

                  NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the parties hereto,
the parties hereto hereby agree to amend the Agreement as follows.

                  1. Defined Terms. Except as hereinafter provided, all defined
terms used herein that are not otherwise defined herein shall have the meaning
ascribed to such terms in the Agreement. As used herein, the term "Cause" has
the meaning ascribed to such term in Section 6(a)(ii) of the Agreement, without
regard to any other provision therein. As used herein, the term "Termination
Payment" has the meaning ascribed to such term in Section 10(b)(i) of the
Agreement, excluding the amounts described in clauses (I), (II) and (III) of
Section 10(b)(i)(2) thereof. In addition, the Employee's employment hereunder
shall be "Constructively Terminated" if the Employer (i) demotes the Employee to
a lesser position, either in title or responsibility, than the position the
Employee held immediately prior to the Change in Control, (ii) decreases the
Employee's base salary below the base salary that was in effect immediately
prior to the Change in Control or (iii) requires the Employee to relocate to a
principal place of business more than twenty-five miles from the principal place
of business occupied by the Employer on the date hereof.

                  2. Installment Payments. (a) Notwithstanding any provision to
the contrary in the Agreement, including, without limitation, the provisions of
Section 10 thereof, the Termination Payment and the Gross Up Payment shall be
paid in two installments. The first installment shall be equal to the sum of (i)
eighty percent (80%) of the Termination Payment and (ii) the Gross Up Payment to
which the Employee would be entitled pursuant to the Agreement if the amount of
the Termination Payment were reduced by twenty percent (20%). Such first
installment shall be paid on the date on which the Termination Payment and the
Gross Up Payment would be required to be paid pursuant to the Agreement, without
regard to this Amendment (the "First Payment Date"). The second installment (the
"Deferred Payment") shall be equal to the sum of (i) the remaining twenty
percent (20%) of the Termination Payment and (ii) the excess of (A) the Gross Up
Payment (calculated in accordance with the Agreement and based on the full
amount of the Termination Payment) over (B) the amount determined pursuant to
clause (ii) of the preceding sentence of this Section 2(a). The Deferred Payment
shall be paid on the earlier to occur of (i) the three-month anniversary of the
First Payment Date, if the
<PAGE>   14
employee is employed by the Employer at such time and (ii) two (2) business days
after the date on which the Employee's employment with the Employer terminates
for any reason other than by the Employer for Cause or the voluntary resignation
of the Employee. If the employment of the Employee is terminated prior to the
three-month anniversary of the First Payment Date by the Employer for Cause or
by the voluntary resignation of the Employee, then the Deferred Payment shall be
irrevocably forfeited without any additional action by the Employer. It is
understood that in the event that the Employee's employment is Constructively
Terminated by the Employer, such termination shall not be considered a voluntary
resignation by the Employee.

                  (b) In addition to the payments under the preceding
subparagraph (a) of this Section 2, on the First Payment Date, the Employer
shall deposit an amount equal to the Deferred Payment into an interest bearing
escrow account (designated by the Employer) for the benefit of the Employee. In
the event the Employer pays the Deferred Payment to the Employee as provided in
subparagraph (a) of this Section 2, the Employee shall also be entitled to the
interest earned on the amount of the Deferred Payment deposited in such escrow
account, in lieu of any interest payments that the Employee may otherwise have
been entitled to under Section 10(b)(ii) of the Agreement.

                  (c) Notwithstanding any provision in the Agreement to the
contrary, including without limitation an Agreement Termination, the Employee
agrees to render services to the Employer as an employee on a full-time basis
during the six-month period commencing on the First Payment Date. In
consideration for such services, the Employee shall be entitled to base salary
at a rate equal to one hundred percent (100%) of his rate of "annualized base
compensation" within the meaning of Section 10(b)(i)(1)(I) of the Agreement,
plus such vacation, insurance, car allowance and health club membership benefits
as are now provided under Section 4 of the Agreement. The Employee shall not be
entitled to any additional benefit in the nature of severance pay upon the
termination of such employment, other than the Deferred Payment, subject to the
conditions provided above.

                  3. Incorporation. Except as expressly provided in this
Amendment, the Agreement shall remain in full force and effect. The provisions
of this Amendment shall be deemed to be a part of the Agreement as if included
therein. Nothing in this Amendment is intended to revise the provisions relating
to the determination and potential adjustment of the Gross Up Payment as
provided in Section 10 of the Agreement, and the Gross Up Payment portions of
the installment payments described herein are subject to such determination and
potential adjustment provisions. In addition, nothing in this Amendment is
intended to affect the Employee's entitlement to the payments described in
Section 10(b)(i)(2)(I), (II) and (III) of the Agreement.

                                       2
<PAGE>   15
                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the 23 day of January, 2000.


                                            CompUSA Inc.


                                            By:/s/ James F. Halpin
                                               --------------------------------
                                            Name:    James F. Halpin
                                             Title:  President and CEO


                                            EMPLOYEE


                                             /s/ James E. Skinner
                                             --------------------------------


                                       3


<PAGE>   1


                        TELEFONOS DE MEXICO, S.A. DE C.V.



                                                                January 23, 2000


Grupo Sanborns, S.A. de C.V.
Avenida San Fernando 649
Colonia Pena Pobre
Tlalpan, Mexico, D.F. CP 14060


Ladies and Gentlemen:

         We refer to the Merger Agreement, dated as of January 23, 2000 (the
"Merger Agreement"), among Grupo Sanborns, S.A. de C.V. ("Grupo Sanborns"), TPC
Acquisition Corp. and CompUSA, Inc. ("CompUSA"), providing for the acquisition
of all of the outstanding shares of CompUSA common stock ("Shares") through a
tender offer and merger.

         The purpose of this letter is to confirm our commitment to you, as well
as our desire and intention, to make (directly or through one of our
affiliates), at your request, a capital contribution of up to US$ 520 million to
the share capital of TPC for the purpose of facilitating the purchase of Shares
pursuant to the Merger Agreement.

         You have our consent to provide a copy of this letter to CompUSA.

                                        Very truly yours,

                                        TELEFONOS DE MEXICO, S.A. DE C.V.



                                        By:  /s/ Sergio Rodriguez Molleda
                                             ----------------------------------
                                             Name: Sergio Rodriguez Molleda
                                             Title: Attorney-in-fact

Agreed and Accepted by:

GRUPO SANBORNS, S.A. DE C.V.


By:      /s/ Jesus Gallardo Dominguez
         -----------------------------
         Name:Jesus Gallardo Dominguez
         Title: Attorney-in-fact

cc:      CompUSA, Inc.
         14951 N. Dallas Pkwy.
         Dallas, TX 75240



<PAGE>   1

         INFORMATION CONCERNING THE MEMBERS OF THE BOARD OF DIRECTORS
                        AND THE EXECUTIVE OFFICERS OF
                      TELEFONOS DE MEXICO, S.A. DE C.V. ("Telmex")

          Set forth below are the name, business address and present principal
occupation or employment, and material occupations, positions, offices or
employment for the past five years of each director and executive officer of
Telmex. Unless otherwise indicated, each such person is a citizen of Mexico and
has held his or her present position as set forth below for the past five years.
Directors of Telmex are indicated by an asterisk.

<TABLE>
<CAPTION>


 NAME AND CITIZENSHIP                   BUSINESS ADDRESS                          POSITION WITH TELMEX; PRESENT
- ---------------------------           ------------------------------------           PRINCIPAL OCCUPATION OR
                                                                                           EMPLOYMENT;
                                                                                 MATERIAL POSITIONS HELD DURING
                                                                                       THE PAST FIVE YEARS
                                                                                ---------------------------------
<S>                                    <C>                                      <C>
David Antonio Ibarra Munoz*            Canada No. 184                            Director. Consultant ECLAC
                                       01710 Mexico, D.F.                        Mexico. Board Member of
                                                                                 Grupo Financiero Inbursa.


Claudio X. Gonzalez Laporte*           Jose Luis Lagrange No. 103, 4 piso.       Director. Chairman and CEO of
                                       Colonia Polanco                           Kimberly Clark de Mexico, S.A.
                                       11590 Mexico, D.F.                        de C.V. Director of Carso
                                                                                 Global Telecom, Director of
                                                                                 Grupo Carso, Director of
                                                                                 Sanborns.

Sergio F. Medina Noriega               Sullivan 199, 8(0). Piso                  Legal Director since February,
                                       Col. San Rafael                           1995. Secretary of the Board of
                                       06470 Mexico, D.F.                        Directors. Secretary of the
                                                                                 Board of Directors of Grupo
                                                                                 Carso, S.A. de C.V. Secretary of
                                                                                 the Board of Directors of
                                                                                 Grupo Sanborns, S.A. de C.V. since
                                                                                 September of 1997; Secretary of the
                                                                                 Board of Directors of Grupo Financiero
                                                                                 Inbursa, S.A. de C.V. between
                                                                                 1993 and 1999; Secretary of the
                                                                                 Board of Directors of Banco
                                                                                 Inbursa, S.A. between 1992 and
                                                                                 1999.

Carlos Slim Helu*                      Paseo de las Palmas 736                   Director and Chairman of the
                                       Col. Lomas de Chapultepec                 Board and Chairman of the Board
                                       11000 Mexico, D.F.                        of Carso Global Telecom, S.A.
                                                                                 de C.V. since 1996. Chairman
                                                                                 Emeritus of Grupo Carso, S.A.
                                                                                 de C.V. since 1998, Chairman of
                                                                                 the Board of Grupo Financiero
                                                                                 Inbursa, S.A. de C.V. since
                                                                                 1998, Chairman of the Board of
                                                                                 Grupo Carso, S.A. de C.V.
                                                                                 between 1991 and 1998, Chairman
                                                                                 of the Board of Grupo
                                                                                 Financiero Inbursa, S.A. de
                                                                                 C.V. between 1993 and 1998.

Jaime Chico Pardo*                     Parque Via  190, 10(0). Piso              Vice President and Chief
                                       Col. Cuauhtemoc                           Executive Officer. Vice
                                       06599 Mexico, D.F.                        President of Carso Global
                                                                                 Telecom since October, 1998,
                                                                                 Board Member of Grupo
</TABLE>
<PAGE>   2
<TABLE>
<CAPTION>

 NAME AND CITIZENSHIP                   BUSINESS ADDRESS                          POSITION WITH TELMEX; PRESENT
- ---------------------------           ------------------------------------           PRINCIPAL OCCUPATION OR
                                                                                           EMPLOYMENT;
                                                                                 MATERIAL POSITIONS HELD DURING
                                                                                       THE PAST FIVE YEARS
                                                                                ---------------------------------
<S>                                    <C>                                      <C>

                                                                                 Carso since August, 1997, Board
                                                                                 Member of Grupo Financiero
                                                                                 Inbursa.

Juan Antonio Perez Simon*              Calvario No. 100                          Director and Vice Chairman.
                                       Col. Tlalpan                              Chairman of the Board of
                                       14000 Mexico, D.F.                        Sanborns Hermanos, S.A.

Carlos Slim Domit*                     Calvario No. 100                          Director. Chairman of the Board
                                       Col. Tlalpan                              of Grupo Carso, S.A. de C.V.
                                       14000 Mexico, D.F.                        since 1998 and Chairman of the
                                                                                 Board and Chief Executive
                                                                                 Officer of Grupo Sanborns, S.A.
                                                                                 de C.V. since 1999. President
                                                                                 of Sanborns Hermanos, S.A. since 1995.

Antonio Cosio Arino*                   5 de Febrero 18, 2(0). Piso               Director. Chairman of Cia.
                                       Col. Centro                               Industrial Tepeji del Rio.
                                       Mexico, D.F.

Amparo Espinosa Rugarcia*              Jose de Teresa No. 253                    Director. Director of
                                       Col. Tlacopac                             Promecasa, S.A. de C.V. since
                                       San Angel, Mexico 01040                   1995 and Director of Demac.

Elmer Franco Macias*                   Felix Guzman 16                           Director. Chief Executive
                                       Naucalpan de Juarez                       Officer of Infra.
                                       Mexico 53390

Angel Losada Moreno*                   Ejercito Nacional 769-A                   Director. Executive President
                                       Col. Anahuac                              of Grupo Gigante.
                                       11520 Mexico, D.F.

Romulo O'Farril Jr*                    Balderas No. 87                           Director. President and Chief
                                       06040 Mexico, D.F.                        Executive Officer of Novedades
                                                                                 Editores.

Bernardo Quintana Isaac*               Paseo de las Palmas 735, 1406             Director. ICA Group President.
                                       Colonia Lomas de Chapultepec
                                       11000 Mexico, D.F.

Paul W. Cardarella*                    One Bell Plaza                            Director. Managing Director
(American citizen)                     Dallas, Texas                             External Affairs of
                                       75202 USA                                 Southwestern Bell. Managing
                                                                                 Director Operations of SBCI-MSI
                                                                                 Mexico between 1993 and January
                                                                                 16, 2000.

Robert Allen Craft*                    Parque Via 190, 12(0). Piso               Director. Finance Director of
(American citizen)                     Col. Cuauhtemoc                           SBCI-Mexico since March, 1998.
                                       06599 Mexico, D.F.                        Director of Financial Planning
                                                                                 and Analysis of SBC between
                                                                                 August 1996 and February, 1998.
                                                                                 Corporate Manager of Financial
                                                                                 Planning and Analysis of SBC
                                                                                 between 1993 and August of 1996.

Richard C. Dietz*                      530 McCullough,                           Director. President
(American citizen)                     San Antonio, Texas                        Telecommunications SBC
                                       78215 U.S.A.                              Operations, Inc. since
                                                                                 December, 1999. President of
                                                                                 SWB Bus. Comm. Svcs. Of SWBT
                                                                                 between November and December
                                                                                 of 1999, President SBCI
                                                                                 (Mexico) of

</TABLE>
<PAGE>   3
<TABLE>
<CAPTION>


 NAME AND CITIZENSHIP                   BUSINESS ADDRESS                          POSITION WITH TELMEX; PRESENT
- ---------------------------           ------------------------------------           PRINCIPAL OCCUPATION OR
                                                                                           EMPLOYMENT;
                                                                                 MATERIAL POSITIONS HELD DURING
                                                                                       THE PAST FIVE YEARS
                                                                                ---------------------------------
<S>                                    <C>                                      <C>
                                                                                 Telmex between February, 1997 and
                                                                                 November, 1999, Vice President and
                                                                                 General Manager of SBC
                                                                                 Operations, Inc. between
                                                                                 January, 1995 and February,
                                                                                 1997.

J. Cliff Eason*                        175 E. Houston, Room 1230                 Director. President-SBC Network
(American citizen)                     San Antonio, Texas                        Operations of SBC Operations,
                                       78205 U.S.A.                              Inc. since November, 1999.
                                                                                 President of SBC International
                                                                                 at SBC Communications, Inc.
                                                                                 between March 1998 and
                                                                                 November, 1999, President and
                                                                                 Chief Executive Officer of
                                                                                 Southwestern Bell Telephone
                                                                                 Company between February, 1996
                                                                                 and February, 1998, President
                                                                                 and Chief Executive Officer of
                                                                                 Southwestern Bell
                                                                                 Communications, Inc. between
                                                                                 July, 1995 and February, 1996,
                                                                                 President of Network Services
                                                                                 at Southwestern Bell Telephone
                                                                                 Company between July, 1993 and
                                                                                 June, 1995.

Michel Hirsch*                         Arne des Fleurs                           Director. Retired. Chairman FCR
(French citizen)                       93360 Nevilly                             of France Telecom between 1996
                                       France                                    and 1999, Vicepresident
                                                                                 International of France Telecom
                                                                                 between 1987 and 1996.

Jean-Pierre Achouche*                  126 Rue Reaumur                           Director. Manager of France
(French citizen)                       75002, Paris, France                      Telecom. Director of Public
                                                                                 Networks and International Affairs
                                                                                 of France Telecom between March,
                                                                                 1998 and January 2000, Director
                                                                                 of Network Operations between
                                                                                 January 1, 1995 and
                                                                                 February, 1998.

Isidoro Ambe Attar                     Parque Via 198                            Sales and Marketing Vice
                                       Col. Cuauhtemoc                           President since June, 1999.
                                       06599 Mexico, D.F.                        Corporate Market Vicepresident
                                                                                 of Telmex between August 1997
                                                                                 and June, 1999, National
                                                                                 Account Head of Telmex
                                                                                 between October, 1995
                                                                                 and July, 1996, Procurement
                                                                                 Assistant Vicepresident of
                                                                                 Telmex between February, 1995
                                                                                 and October, 1995.

Adolfo Cerezo Perez                    Parque Via 190, 10(0). Piso               Chief Financial Officer.
                                       Col. Cuauhtemoc
                                       06599 Mexico, D.F.

Javier Antonio Elguea Solis            Insurgentes Sur 3500, 3er. Piso           Human Resources Vice President
                                       Col. Pena Pobre                           since 1995.
                                       14060 Mexico, D.F.

Arturo Elias Ayub                      Parque Via 198 - 701                      Executive Vice President of
                                       Col. Cuauhtemoc                           Information, Industry Service
                                       06599 Mexico, D.F.                        and Government Affairs since
                                                                                 March,

</TABLE>
<PAGE>   4
<TABLE>
<CAPTION>


 NAME AND CITIZENSHIP                   BUSINESS ADDRESS                          POSITION WITH TELMEX; PRESENT
- ---------------------------           ------------------------------------           PRINCIPAL OCCUPATION OR
                                                                                           EMPLOYMENT;
                                                                                 MATERIAL POSITIONS HELD DURING
                                                                                       THE PAST FIVE YEARS
                                                                                ---------------------------------
<S>                                    <C>                                      <C>
                                                                                 1997. Advisor to
                                                                                 the CEO of Telmex between
                                                                                 November, 1996 and March,
                                                                                 1997.

Eduardo Javier Gomez Chibli            Norte 4, No. 6113                         Technical and Long Distance
                                       Col. Popo                                 Vicepresident since 1997. Long
                                       11480 Mexico, D.F:                        Distance Vice President of
                                                                                 Telmex between 1995 and 1997.

Daniel Hajj Aboumrad                   Lago Alberto 366                          Subsidiaries of Telmex. CEO of
                                       Col. Anahuac                              Radiomovil Dipsa.
                                       11320 Mexico, D.F.

Roberto Isaac Rodriguez                Parque Via 190, 10(0). Piso               Vicepresident International
                                       Col. Cuauhtemoc                           Ventures since 1998 and Chief
                                       06599 Mexico, D.F.                        Executive Officer Carso Global
                                                                                 Telecom. CEO of Afore
                                                                                 Inbursa between 1996 and
                                                                                 1998, Vice President of
                                                                                 Communication of Amafore
                                                                                 between 1996 and 1998,
                                                                                 Deputy CEO of Seguros
                                                                                 Inbursa between 1996 and
                                                                                 1998, CEO of
                                                                                 Tecmarketing between
                                                                                 1996 and 1998, Executive
                                                                                 Vice President Property
                                                                                 Casualty and Claims of
                                                                                 Seguros Inbursa between
                                                                                 1994 and 1996.


Hector Slim Seade                      Parque Via 198, 8o. piso                  Operations Support
                                       Col. Cuauhtemoc                           Vicepresident since 1998.
                                       06599 Mexico, D.F.                        Vicepresident of Supplies of
                                                                                 Telmex between 1997 and
                                                                                 1998, Assistant
                                                                                 Vicepresident of
                                                                                 Supplies of Telmex
                                                                                 between 1995 and 1997,
                                                                                 Head of Factoring of
                                                                                 Inbursa between 1995 and
                                                                                 1996, Head of Personal
                                                                                 Guarantees of Guardiana
                                                                                 Inbursa between 1990 and
                                                                                 1997.


Andres R. Vazquez del Mercado          Parque Via 190                            Executive Vicepresident
Benshimol                              Col. Cuauhtemoc                           Corporate Development since
                                       06599 Mexico, D.F.                        June of 1999. Commercial
                                                                                 Vicepresident of Telmex between
                                                                                 June of 1994 and June of 1999.

Oscar Von Hauske Solis                 Paseo del Rio 186                         Corporate Vicepresident of
                                       Col. Chimalistac                          Systems and Procedures since
                                       Mexico, D.F.                              September 25, 1995. Financial
                                                                                 Head of Servicios Condumex,
                                                                                 S.A. de C.V. between 1992 and
                                                                                 September 25, 1995.

Francisco Javier Mondragon Alarcon     Parque Via 190, 501                       General Counsel. Manager
                                       Col. Cuauhtemoc                           Partner of Bufete Mondragon
                                       06599 Mexico, D.F.                        Alarcon, S.C. since May of
                                                                                 1999, General Counsel
                                                                                 and Secretary of the
                                                                                 Board of Grupo Televisa,
                                                                                 S.A. from January 1,
                                                                                 1995 to May 31, 1999,
                                                                                 Executive Vice President
                                                                                 and Secretary of the
                                                                                 Board of Grupo
                                                                                 Televicentro, S.A. and
                                                                                 Grupo Alameda, S.A. from
                                                                                 January 1, 1995 to May
                                                                                 31, 1999.
</TABLE>



                             4


<PAGE>   1
                                POWER OF ATTORNEY


                  I, Alejandro Escoto, authorized legal representative of Grupo
Sanborns, S.A de C.V., a corporation with variable capital (sociedad anonima de
capital variable) organized under the laws of Mexico (the "Company"), hereby
constitute and appoint Eduardo Valdes Acra and Rafael Robles Miaja, and each of
them singly, my true and lawful attorney-in-fact and agent, with full power of
substitution and resubstitution, to act, for me and in my name, place and stead
and on my behalf, in any and all capacities, to sign any Schedule TO, Schedule
13D or Schedule 13G and any and all amendments thereto and any other document
relating thereto, and to file on my behalf any such Schedule TO, Schedule 13D or
Schedule 13G required to be filed pursuant the Securities Exchange Act of 1934,
any amendment thereto and other document relating thereto and any exhibit
thereto with the United States Securities and Exchange Commission, hereby
granting unto said attorneys-in-fact and agents, full power and authority to do
and perform any and all acts and things requisite as fully to all intents and
purposes as I might or could do in person, hereby ratifying and confirming all
that said attorneys-in-fact and agents may lawfully do or cause to be done by
virtue hereof, and this power of attorney shall be irrevocable until December
31, 2002.

                                     GRUPO SANBORNS, S.A. DE C.V.

January 31, 2000                     /s/ ALEJANDRO ESCOTO
                                     --------------------------------------
                                     By: Alejandro Escoto
                                     Title: Authorized Legal Representative



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