Need a company to advertise a product in certain forums

[directresponse]

I'm looking for a company that has active forums members that would be willing to promote products that I advertise.

I've seen this done very effectively on bodybuilding.com where a new supplement company will give samples to a forum memeber and that person will not only review the product, but also answer questions about the product.

This isn't like a one time review but something that actively do.

I was told there is a company that can broker and manage the deals with the forum members but I can't find one.

Does anyone have any ideas?

Thanks