I live in Katy, outside of Houston.
The 3 stores that I know of have already been mentioned, in order of my favorites...
Cake Craft Shoppe
Make a Cake
I've never had a problem with Cake Craft Shoppe. They have fabulous classes there. I've taken classes there from Nicholas Lodge, Earlene Moore and the owner, Sheila Brooks. I took her gum paste flower class. She has always been incredibly friendly and helpful. One time while browsing, I mentioned that I had a particular daisy cutter that I could not figure out how to use and she pulled one off the shelf, opened it up and proceeded to show me how to use it. Now THAT's customer service!
And funny story about Make A Cake, before my cake days, when I was a teenager (25 years ago!), my best friend's boyfriend played in a band that practiced in the back of this store where one of the other guys, Dave, worked. When I got into cake decorating several years ago I went to the store, and Dave STILL worked there, as manager! LOL! He's gone now, though, since the owner's family has taken over management.
That's when Amazing Cakes opened. I guess because I knew Dave, I give them most of my business. They hired him as manager. It didn't seem to work out, though, as he is now gone. I wonder what he's doing...
Anyway.....looong winded post from a Proud Texan!