Yo, i don't usually post on this forum, so I don't know if Casino bonuses are allowed, or if this has been posted here before.
My friend just told me about this, and I tried it, didn't make it though
http://www.7sultans.com/freetime/
the access code is Test777
You get 15 minutes to play with $500 (max bet $2-10 depending on the game), and you must bet at least $100 in the 15 minutes. When the 15 minutes are up, any balance over $500 gets transfered to your real account, and to release it you deposit $20 and play through 20x.
Might be worth a shot if you have 15 minutes to kill. I did $5 Video poker and ended with $470.