Free casino as in one that lets you play the games for free?
Almost all of them do that.
Try this one:
http://www.romanpalace.com/affiliate...gent_id=weirdo
They let you play for free. Of course you can't win anything unless you get out your credit card. But you can play for fun. It gives you a good idea on how much you could be winning, or more likely, losing.
:^)