tropez mobile with euro partners and Crazy Mobile Casino with vegas partners, Bookmaker mobile.
Also according to Candice at brightshare US players are not supported by spin3 software http://www.casinoaffiliateprograms.com/bb/news-flash-at-wild-jack-mobile-casino.25633.html?
The only one that I can find that supports US Players is Slotland and Bookmaker.