B2B Marketplace Site

Dear All, I will just make it short, by now i am sure that alot of developers already created different versions of B2B sites, i need a developer who created a similar site to show me a demo where we can start with and customize. We don't need to reinvent the wheel here. I bought a script before and hired a freelancer before but all results are no good for me. budget is based on the quality of the site you are providing, i know there are alot of ready made b2b scripts but almost all i checked and not happy with the quality. I care alot about the design to be simple, professional and light in term of speed. I need a feature which is basically to provide private label affiliate program.. meaning , you own a domain [login to view URL], you join my program and bang your site is ready and running , you only add your logo and little customization texts. This is not critical now but just to keep it in mind maybe a future addition or upgrade. Looking forward to hear from you soon