As in you want the name of stores in those areas? Because Houston/Dallas are not really central texas ... but if you are looking for them,

Houston: Two of the bigger ones are Fat Ogre in the Woodlands and Ettin games in Humble.
San Antonio: Tabletop is a newer store, but running huge tournaments and leagues and really cool. They also have a Dragon's Lair, and Alien Worlds.
Dallas: Madness Games in Plano is a massive store with multiple gaming tables (one of the coolest stores I've ever been in, if a little corporate and impersonal).