I can comment a bit on Vin's dwarf boa prices -- I've got a boa from him, and I see him at expos fairly frequently.
The boas you see commanding a high dollar on his Facebook page are typically his holdback-quality and rare locality stuff. He's typically got a lot of good dwarf boas in the US$200-400 range in the late summer and fall -- think hypo het leopard Sonorans, hypo het blood Central American crosses, a few Mexican and Central American localities, that sort of stuff. Visual leopard or blood boas are when you start breaking into the US$600-800+ range.
Vin's boas are worth the money, in my opinion. The boas he breeds are high quality -- the locality boas are pure, the morph-y boas are beautiful, and I haven't heard of anyone getting a boa from him that wasn't clean and healthy. The man knows and cares for his boas, and it shows.
Back to your original question: I wouldn't recommend housing a dwarf boa in a 40G tank. A 4'x2'x2' PVC or wooden enclosure would be far more appropriate for their size and activity level, with the benefit of easier temperature and humidity control. I say this as someone who has young boas in a 4'x2'x2' PVC enclosure and a 20L tank right now. I can't wait to move the boa in the 20L out and into a PVC enclosure -- I've insulated that tank and covered the top, and it's still a struggle to keep things where they need to be! If you're set on using the 40G, an Antaresia python or rosy boa would be best. Good luck!








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