also, call all the high school in town and see which one offer lesson on stick shift. I think you are not trying hard enuf. Houston is a big town and I am very certain there are driving school that offer manual lesson.
here, i did a search for you. Call each one of these and I am very sure one of them offer manual training.
http://search.yahoo.com/search?p=dri...p=mss&ei=UTF-8