Clone ''Book Buying'' Website

In brief, we need to clone [login to view URL] with some changes and added features. This website looks up books on Amazon using ISBN or book title, checks the used prices, and makes an offer to purchase books using a formula to determine how much if anything to offer the book. The script interfaces with Amazon's E-Commerce Services to make queries on books in Amazon's inventory and also needs to interface with the United States Postal Service's (USPS) Web Tools to create "Merchandise Return" labels. There is an admin section, of course. Please take careful note of how Cash4Books operates, of course. We have a few additional features we would like to add and changes we would like to make.