M37 Trucks are not all that expensive. That same model year in a Dodge Power Wagon (which shares many of the same components) in similar condition would probably
start at 4 times the price of this one.
It's when you go the "resto-mod" route that they get expensive (replace with a modern diesel or V8 engine, which probably also requires new axles, transmission and transfer case, and upgraded brakes to handle the higher speeds). If you can live with a truck that is comfortable going 40-45 MPH and maxes out at 50-55, they can be a good match. If you want a "go fast" truck, you are probably better off getting a modern truck: by the time you make the changes to one of these to get it safely to highway speeds, you'll probably have the same amount of money into it (more if you are paying someone else to do the work.)
If you are seriously in the market, Check out the
Dodge M37/M43 Facebook group. There are always some mentioned for sale there.