I will try it out tonight.
Maybe you can try
Play Online Games for Money - GSN Cash Games, I have never used them, but I know they have an affiliate program. You can also try promoting fanduel or something like that.
Yahoo is always promoting Williams Interactive slot games. I don't know if they have an affiliate program, or if you can make any money off it.
If you are in an area where it is legal and the hosting allows it, Lots of bitcoin gambling sites.