First of all, they are not scam, the online casinos 
just like the real pay when you win, they are 
externaly checked so its impossible to cheat,
I can suggest you the best USA friendly casinos,
here you will find more info 
http://www.gamblingsafe.net/usa-friendly-sites/usa-casinos.html
Probably intertops or rushmore will do the job for you.