This is the website that I used when I was researching them. It has alot of useful information:
http://www.dumerilboa.com/index.html
Their temperature and humidity requirements are comparable to that of Ball Pythons and Red Tail Boas. I keep mine at 78-80F cool side and 90-92F warm side and humidity around 55%-60%. You can house them in tubs until they reach about 4ft or so, then you should be looking for something like a 4 X 2 or 6X2 permanent enclosure for the adults, depending on whether you get a male or female. They are ground dwelling boas, so they don't need a tall enclosure. Mine is set up with the standard 2 hides, water bowl, and a piece of drift wood/fake rock for rubbing on. I do recommend a little larger water bowl, as they tend to drink more water and will occasionally soak themselves. As with most snakes, some may be a bit nippy as youngsters but are mostly docile with regular handling. As adults, the males will average about 5.5-7ft and the females will average about 8-9ft. I got mine at a reptile show, and with a bit of haggling, I got the vendor to let me have him for $100, but prices will depend on the age/size of the snake, shipping, etc. Hope this helps...