Welcome aboard Jay.
As Tyson said, Wonko's is the gaming store closest to Cedar Park. They have several Fantasy players, but I haven't seen any games in a while. If you talk to Eric (the owner), he should be able to put you in touch with some of the others. They do have a pretty active RPG community. We'll be having a 40K tournament this Saturday
http://www.wonkos.com/home/
The truth is that Tenth Planet is actually in Cedar Park, but doesn't do GW games. They mainly do WarmaHordes.
http://www.tenthplanetstore.com/
And, of course, Dragon's Lair is the local gaming Mecca. Whatever you want, they have.
http://dlair.net/austin/