You should join FB Tree Python pages. You can get lots of info there.

And it's not that GTPs are more expensive, they just arent as commonly kept as BCIs, cornsnakes, retics, burms, BPs and stuff like that. There are plenty of cheap ones around like from Bush Master or other importers. I've seen them as low as $250 but of course those are imports so after the vet visit, dewormers and stuff, you are looking at $500 lol. Plus you can find more common GTPs like Biaks for fairly cheap, even CBB ones.