15768 Buy/Sell marketplace $500 MAX

I HAVE INCREASED MY BUDGET TO $500 PLEASE READ CAREFULLY BEFORE YOU BID. Dear coders, I'm looking for a marketplace script which allows users to buy and sell items, search categories, buy and sell & send mail to other users. I WANT something like [login to view URL] where we have MULTIPLE sellers for the same product listing and A buyer can pick SELLER OF CHOICE FOR THE PRODUCT. PLEASE SEE [login to view URL] MARKETPLACE TO SEE A FULL REQUIREMENT OF WHAT I WANT. A demo would be preferred. Buyers and sellers MUST be able to leave FEEDBACK for one another. It should also include payment systems such credit card, paypal etc. Please visit [login to view URL] to see an example of what I'm looking for. NOTE: I'm NOT looking for auction system.