I also prefer sites that stick to their niche.
There are more solo fetish sites out there, mostly based in Europe rather than in the US, and only a few have affiliate programs.
A couple of sites you may already be aware of with CCBill programs:
http://www.rubberdoll.net/ - US
http://www.lady-sonia.com/ - UK
Some EU based leather & latex solo sites:
http://www.missfuzzybunny.com/
http://www.fetishlady-anja.de/
http://www.lady-petra.de/
http://www.redoptics.com/
http://www.fetish-vanessa.com/
http://www.the-fetish-queen.de/
http://www.lady-darkness.de/
http://www.thighboots-and-leather.com/