There are many affiliate programs that are not on some of the networks. There was one site that I was building and there was a lack of affiliate programs for the niche that I was going for. With a simple google search I found a few merchants that had the products that I needed and that had in house affiliate programs. The only thing with going this way is that you might not get paid or they can steal your sales through their tracking system. It’s a good idea to test their site by placing a few orders and measuring traffic if you are using PPC to see if it all adds up. There would be nothing worse then send tons of traffic to a site and then getting screwed out your commission. You might also want to call the affiliate manager for the site and ask a few questions. You can also do a google search for other affiliates signed up to this company. Get reviews or other information. If the company screwed other affilaites a simple google search would turn up many negative remarks.