Vin Russo is very accurate. His information is totally correct. But take note: the sizes he gives are generally at what size the boa will BREED at. NOT necessarily the maximum size they will get. There is a difference.

You can use one of the Iris Christmas tree boxes for boas. They are roughly 4x2x2 in size. However, good luck finding them. I believe Iris has discontinued making them. I haven't found them in stores anywhere in the last couple of years. If you are lucky enough to find some, let me know!!!

No other tub is appropriate for an adult boa (babies can be raised in tubs until they are 2-3 feet, depending on temperament).

You can get a 4x2x15" from Animal Plastics for $195. It's not a full 2' high, but it might do for one of the smaller localities you've mentioned. That's about what you'd put into a glass tank - and a pvc enclosure is SO much better.....