Here's a good one for you. We started new affiliate program to help autistic children--Product FREE--You get $35
That does look like a good offer. Another suggestion might be researching some of the natural vitamins/minerals that have been shown to alleviate symptoms. A program like Native Remedies on Sharasale is one to check.
If I were you, I would still go for Adsense as my affiliate program. Adbrite and Clickbank are good Adsense alternatives, though.