Need a marketplace script

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Dear all.

Our site is

We are now looking for a marketplace script with the following. Our very
basic requirements :

1. The buyer should be able to place his requirements(for free).
2. The seller should be able to place his products(free or at a price - the
admin should be able to configure what price the seller shall pay for his
3. Buyer interface - all ads put, response, re-insert ads, etc
4. Buyer/seller membership module.
5. Payment by paypal.
6. Contact management and emailing system
7. Banner management
8. Adsense management
9. searches and related searches.
10. Categories and sub-categories of equipment, products for sale.

Can anyone suggest a tried out and robust solution?


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