Teas has some (it's just outside the greenhouse, near the roses) very basic varieties, some Oldhamii, Alphonse Karr, D. Strictus, B. Ventricosa, etc.

There is a slightly more interesting selection at Joshua's Native plants in the heights. If you've never been, it's a very fun nursery, and worth the trip. http://users3.ev1.net/~joshua64/index.html

I have seen some at Houston Garden Center, but beware. All the ones I've seen have not been labeled, or horribly mislabeled. You'd hate to end up with a runner!

Newton's has Oldhamii,where I got mine. Which Houston Garden Center?
The one on IH610
west does not.

I saw it at the one at 610 and westpark. The last time I saw some (last time I was looking) was in February. They really were horribly mislabeled though. I think they were in the section in the back with the tall trees.

You might also want to try Caldwell Nursery. See their link below.

Mike near Brenham TX

Here is a link that might be useful: Caldwell Nursery

This guy has some big bamboos, north Houston.

http://www.bambootexas.com/

Maas Nursery in Seabrook has several varieties.

Kt