Similar Site to Fiverr.com for selling leads

I'm looking for someone who might have already developed a site similar to fiverr and is happy to use that as a basis for site to sell leads for a niche on and have the ability to allow users to sell leads on it too. It should have the following features at least: Admin panel Paypal integration Search system Order Tracking Email Notifications. If you have developed something similar please let me know and if possible show me a demo. There would be some customisation required in order to make it work for selling leads but the development should be minimal. There would need to be some development around building some automation inot importing leads from one system to another.