EXHIBIT 10.4

                            FIRST AMENDMENT TO LEASE

     THIS FIRST AMENDMENT TO LEASE  ("Amendment") is made and entered into to be
effective as of April 4, 2000, by and between Enterprise  Properties,  L.L.C., a
Missouri limited liability company ("Lessor"),  and Pharmacy Buying Association,
Inc., a Missouri corporation ("Lessee"), who agrees as follows:

     WHEREAS,  Lessor and Lessee are  parties to that  certain  Office  Building
Lease dated as of July 7, 1999 (the "Lease"), pursuant to which Lessor leases to
Lessee certain Premises  described as Suite 100, located on the 1st floor of the
building  located  at  1575  Universal  Avenue,   Kansas  City,  MO  64120  (the
"Building"); and

     WHEREAS,  Lessee  desires to expand the  Premises to include an  additional
1,055 r/s/f  (approx.)  of  continuous  space in the  Building  (the  "Expansion
Space") (to be carved out of adjacent Suite 110), and to concurrently extend the
Term of the Lease; and

     NOW,  THEREFORE,  in  consideration  of the  above,  and for other good and
valuable consideration,  receipt of which is hereby acknowledged, subject to all
of the terms,  covenants  and  conditions  herein and in the Lease,  the parties
agree that the Lease shall be and hereby is modified,  amended and superseded in
the following particulars:

     1 DEFINED TERM. Each capitalized term used in this Amendment shall have the
same  meaning as is  ascribed  to such  capitalized  term in the  Lease,  unless
otherwise modified herein.

     2 PREMISES. Effective as of June 1, 2000 (subject only to Lessor remodeling
and delivering  control over the Expansion Space to Lessee as provided  herein),
the  Premises  will be deemed  expanded  to  include  the  Expansion  Space.  As
expanded,  the Premises shall be deemed to comprise 5,811 r/s/f in total,  which
shall all be referred to as Suite 100 (the Premises, as expanded, is depicted on
Exhibit "A" attached hereto).

     3 CONDITION OF PREMISES; REMODELING. Lessee hereby acknowledges that Lessee
occupies and is conducting its business in the Suite 100 portion of the Premises
and hereby  confirms that the Premises,  as will be expanded,  are in good order
and repair and  satisfactory  condition,  and are hereby accepted in "AS IS" and
"WHERE IS" condition and configuration.  Lessor, at its cost, shall complete the
following minor remodeling improvements in the Expansion Space:

     (a)  remove approximately 10' of interior wall;
     (b)  remove door leading into  adjacent  vacant space (the balance of Suite
          110) and close door opening;
     (c)  create new  drywall  opening to combine the  Expansion  Space with the
          original Premises;
     (d)  paint ceiling grid and replace ceiling tile with building standard;
     (e)  replace carpet and base with new building standard; and
     (f)  paint all walls and doorframes with two coats of latex paint.




     In addition, at its cost, Lessor shall provide new building standard carpet
and base in that portion of the original  Premises which is directly adjacent to
the Expansion Space (approximately 460 s/f). The parties acknowledge that Lessee
shall have  possession  and occupy and be in control of the Premises  during the
course of any such  remodeling  work.  All such work shall be done during normal
working hours, and coordinated by and through Lessor and/or contractors  engaged
by Lessor.

     4 EXTENSION OF LEASE TERM. The term of the Lease is hereby  extended to run
through and expire on June 30, 2003.

     5 BASE RENT.  Through the balance of the Lease Term, the Base Rent shall be
adjusted to be payable in the following amounts:

                                                                    Monthly
                                                                   Base Rent
         (a)      through May 31, 2000 (unchanged @):              $4,557.83
         (b)      from June 1, 2000 through December 31, 2000:     $5,568.88
         (c)      from January 1, 2001 through December 31, 2001:  $5,811.00
         (d)      from January 1, 2002 through June 30, 2003:      $6,053.12

     6  PRO-RATA  SHARE;  BASE  YEAR.  Effective  as of June 1,  2000,  Lessee's
Pro-Rata Share (for computing  Excess  Operating  Expenses and Excess Taxes,  if
any) shall be deemed to be 16.6% (the  Building is  comprised  of  approximately
34,978 r/s/f). Lessee's Base year shall remain the calendar year 1999.

     7 TERMINATION OF OPTIONS. Any and all options, including but not limited to
rights of first refusal,  extension  options and/or early  termination  options,
which  may have  been  applicable  during  any  prior  Lease  Term,  are  hereby
terminated and deemed inapplicable and of no further force or effect.

     8 RATIFICATION;  ESTOPPEL;  BINDING EFFECT. Lessee hereby acknowledges that
Lessee occupies and is conducting its business in the Premises and the Premises,
as  currently  constituted,  are in  good  order  and  repair  and  satisfactory
condition   and  are  accepted  in  their  "as-is"   "where-is"   condition  and
configuration.  Lessee  hereby  confirms  that the  Lease is in full  force  and
effect, has not been changed,  modified or amended,  except as summarized above,
and is free from default by Lessor and/or Lessee. Lessee is not aware and has no
notice of any claim,  litigation or proceeding pending or threatened against the
Premises or the  Building  or relating to the Lease,  and there are no claims or
basis for  allowances,  concessions,  offsets or entitlement  under the Lease or
against  Lessor  or  otherwise.  Lessee is not aware of and has no notice of any
violation of any law or statute,  code,  ordinance or directive  relating to the
use or  conditions  of the  Premises  or the  Building  or  Lessee's  operations
therein,  and  Lessee  confirms  that  Lessee  accepts  the "as is"  "where  is"
condition and configuration of the Premises.  Except as specifically  amended as
provided  herein,  the Lease is hereby ratified and confirmed by the parties and
shall remain  unchanged  and in full force and effect for the Term, as extended,
subject to the terms and provisions thereof and hereof.

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     9 BROKER.  Lessee  represents  to Lessor that Lessee has not dealt with any
real estate broker,  salesperson or finder in connection with the negotiation of
this Amendment other than Jury & Associates, Inc., and no other person or entity
representing  Lessee is entitled to any compensation or commission in connection
herewith.  Lessor shall be  responsible  for any commission due the above broker
and/or any other broker with whom Lessor has dealt.

     10  SUBMISSION.  Submission  of this  Amendment  by Lessor  or  Lessee  for
examination  and/or  execution  shall  not  in any  manner  bind  Lessor  and no
obligation  on Lessor  shall  arise under this  Amendment  until and unless this
Amendment is accepted and signed by an authorized agent of Lessor.

     11 BINDING EFFECT.  The Lease,  as hereby  amended,  shall continue in full
force and effect,  subject to the terms and provisions  thereof and hereof,  and
shall be  binding  upon and inure to the  benefit  of  Lessor,  Lessee and their
respective successors and permitted assigns.

     12 CONFLICT; INTERPRETATION. In the event of any conflict between the terms
of the  Lease  and the terms of this  -------------------------  Amendment,  the
terms of this Amendment shall control.

     IN WITNESS WHEREOF, the parties have executed this AMENDMENT TO LEASE to be
effective as of the date first set forth above.

Lessor:                                 Lessee:

Enterprise Properties, L.L.C.,          Pharmacy Buying Association, Inc.
a Missouri limited liability company    a Missouri corporation

By:                                     By:
   ----------------------------------      -------------------------------------
     Paul P. Denzer, its Manager           Nick Smock, its President and CEO/CFO


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