Dave Katz breeds them. Google DK Reptiles and/or Dave Katz for his contact info. I've been to his facility and seen his animals. Dave is a stand-up guy with great stock. you can't go wrong dealing with him.
As for their husbandry - there's a lot NOT on the cookie-cutter care sheets that prospective owners should be aware of.
(1) They need it dry. Subocs come from an arid environment where they have a limited exposure to bacteria. This means that they have a very weak defense over common bacterial infections.
It used to be de rigeur that suboc owners had unexplained casualties. We all went through it. Through trial and error the suboc community gradually found that the best way to keep them was dry, and with a lot of ventilation. I keep mine in either tubs that are so riddled with holes they look like they were sprayed with buckshot, or in screened cages. Always keep in mind they are a ventilation-hungry species.
(2) They are prone to gastric infections. Whether or not they are a by-product of eating a rodent based diet is still unknown. There is a theory circulating that they have issues digesting whole rodents - especially the skins. Some owners have experimented with pre-slicing open rodents, breaching the skin with multiple cuts, or in my case, abandoning rodents and feeding them an alternative diet.
I've noticed that since going on a non-rodent diet that their feces doesn't stink as much and they digest their meals much quicker.
There is an excellent article in the latest Herp Nation magazine that touches on the captive care of the other Bogertophis species - the rosaliae. In it, the low bacterial resistance and dietary issues are discussed in much better depth and breadth than I could ever hope to cover here. The next issue of the magazine will cover subocs and these articles are being written by someone who is probably the foremost authority on these snakes - Dusty Rhoads
........and yes, the husbandry challenges between subocs and rosaliae are pretty much identical.
Anyway, you can Google for pics. Here's one of mine from a few years ago:
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