I'm looking for a marketplace script which allows the users to buy and sell items , search categories, buy and sell & send mail to other users. A demo would be preferred. Off course a admin section is required. Buyers and sellers should be able to leave feedback for one another. It should also include payment systems such credit card, paypal etc.
A close example of what I'm looking for is [url removed, login to view] or amazon. Marketplace. NOTE: I'M NOT LOOKING FOR AUCTION/BIDDING SYSTEM.
Coders with existing script preferred.