Have you looked at some of the
affiliate software listed here.
I do some of the affiliate program approvals on AffiliateSeeking and have noticed an increased amount of affiliate programs getting added that are using the iDevAffiliate and PostAffiliatePro scripts.
I've never used any of them as a merchant, but have joined a few affiliate programs as an affiliate that use them softwares. They seem alright to me as an affiliate, but not sure how a merchant finds them. They seem to be reasonably priced also I think.