Star City Casino
Star City not only has Texas Hold 'Em games running 24/7, but also Manilla, draw-five, seven-card stud and Omaha. There's usually a wait on the smaller limit Hold 'Em games, but there are plenty of other ways to shed your cash while you wait for your seat to be ready.
National Poker League
With free and $10 tournaments all over town, the NPL runs in seasons, but it's fine just to turn up and play. If you do attend regularly, you can be eligible to play in the finals, with prize money over $25,000. Check their website for comprehensive listings.