If you mean not many used Travatos in the Houston area, in your "back yard", that may be true. I don't know, personally. Unless you meant "that you can afford"? Class B vans usually hold their value better than the other motorhome options.
Further afield, there are lots, if you don't mind a road trip.
That's how the used RV thing works, usually.
Sometimes you gotta do a road trip or two to find them with what you want, at a price you can handle.
https://www.rvtrader.com/Travato/rvs...distance%3Aasc