netpox, about the only one I can think of with no setup costs or monthly fees that has been in business for a long time is Cyberbounty
CyberBounty.com Video Affiliate Network They have been around since 1998.
They have a few big name merchants, but not a lot. Probably two of the best known are eLearners and NetFlix.
However they only accept Automotive, Education, Financial, Freebies & Free Trials, Health & Beauty and Insurance merchants.