I don't know specifically in Houston but you could check with your local Play it Again Sports and I have also heard Target is carrying them now.
If you are willing to order online I along with several people I know have bought from http://www.muscledriverusa.com/grsev2ke.html
. Good product, pricing and prompt shipping. I have no affiliation with the site.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin