Oh hey, a fellow Houstonian. I saw your post on the NY toku shop thread. I was going to reply, but didn't feel it relevant enough to the thread, so I came here instead.
Houston has a couple of cool shops. Practically zero toku stuff though. I was so excited when I saw the Shinkenger figures at TRU, but those don't really count. Really, the only Japanese things I find are Gundam Models and a couple of figures here and there. But nothing significant.
Oh and interestingly enough, I'm the one that bought the Gokai Silver candy key from Sentai Tamashii.