Posted my reply before I saw the last comment, sorry snakeballs. I looked on craigslist a little bit, but right now we didn't have the space for big glass ones unless we were putting them out in the living room where I can't monitor their temperatures and humidity levels as well. We keep our snakes in our bedroom with us and this room is suited well for them since we're always in it and its pretty warm. The other rooms of the house get pretty chilly at night and really hot during the day because of the sliding doors and large windows. Plus our cat is the spawn of Satan and would stare at them all night without supervision. Our other snakes actually have black poster paper on the fronts so the cat doesn't bother them, lol.

When the rainbow boa gets too big for her 20 gallon we'll probably put it on craigslist too