Electronic Sales Script - repost

Project is relatively simple. 1. Buyers can register on their own. 2. Sales accounts are added by admin, and all items must be added by admin. 3. all items are delivered via a PDF and do have limited quantities. 4. There is no need to develop the admin panel. 5. site is to be build using SMARTY on front end. 6. payment gateways supported will be: paypal & google basically I am looking for a simple shopping cart (with multiple "shops"), the pdf generation, and the payment processing side. I am not looking for modified oscommerce. if you have something similar to this already I would be interested in demo's. you do not have to build the template for site. all modules needed: 1) banner advertising. 2) pdf generation of items sold (will be emailed to purchaser) 3) checkout about the pdf generation: it will have limited images (approximately 3 - 4) and the remainder will be text from database perfer this to be clean code as this is the baseline for the project. as I have never build a shopping cart from scratch the db design will be up to you, but I can build admin side, just need some help on the front end. the other problem, I need this done in about 3 days from selection, I don't think this will be a major problem, but just need to make sure you realize this.