Shopping cart solution for digital products

We are setting up a new web site selling clip art, and are looking for shopping cart solution. Ideally we would like users to browse our site add the clip art item(s) they require to their basket and check-out (via PayPal). On acceptance of order we would like the clip art to be e-mailed to the customer (.zip format). [login to view URL] have produced 'Clickmail' which is almost exactly what we want, except that it only allows one product to be ordered at a time. Does anyone know if this can be achieved? ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Perl, PHP or any other format that will achieve desired result.