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One of the early lessons I learned in the Boy Scouts was how to read and use topo maps. I can remember hiking the Sandia Mountains East of Albuquerque and using them. When I moved to Pennsylvania, we did cross-country hikes over nearby hills using topo maps. But I haven't had a chance to do anything like that recently for the reason that you are finding out - those maps are not very available anymore.

Garmin makes (made?) some really good portable GPS units that were designed for hikers and had topo features in them. It isn't quite the same as using a large paper version but it is better than nothing. I have friends who hike Harriman State Park (NY) and used the Garmin units. There is a lot more vertical change there than in Texas.

I hope that you can find a source for good Texas topo maps. I'd love to see them.