I'm looking for one my self but I'll say Welcome aboard anyways.
What parts of Texas you in?
I'm sure others can chime in with better help but, I guess it depends on what your looking for, your price range and how fair you're willing to travel for it. Also, mileage effects the price of a car it seems...the lower the miles, the higher the price range is.
T-types = seems to be easier to get and sometimes cheaper than a GN but same basic car. They seem to run around 5-8k in decent shape but seem to top out around 16k.
GN = thesee seem to run around 8-10k for a decent vehicle but can get as high as 20k easy.
GNX = tons of $$$ - cheapest I've seen one sell is like 75k and the highest so far I've seen was around 150k.