Texas Longboards. They are the best longboard place around. They are actually located IN dallas, with inventory in denton as well, if thats at all helpful.
Everything is pretty much ran online, not in a store, but hes got most of the essentials and im sure he'd be more than happy if you wanted to pick it up or whatever. Check out their website. they are great people.
I picked up a sector 9 board at Collective in Dallas, well Southlake, they have a really good selection of them. I would never tell anyone to get anything at zumiez myself, but hey.