How big is the BP you're getting? A tub setup is extremely cheap, and can accomodate any size (6qt for hatchling up to 41qt for large adult female). The largest tank a BP would ever need is a 40-gallon, and that would still be for a very large female. There are a lot of opinions for/against tubs/tanks, but tubs are just incredibly easy to me - great for maintaining humidity, cheap, and you can get a second one so you can just move him/her to a fresh tub when the time comes to clean the one that's dirty.