A 28qt tub with a locking lid would probably last it until it's two years old or older, you just need a heating pad to put under one end of it. Functionally it would be great and cheap, down side is it's not much to look at and doesn't put your brb on display where you can see it. I would suggest a 20 gallon aquarium with a secure lid, it's probably going to have a screen top so you'll want to cover that with either a towel or aluminum foil to cut down the air flow and keep humidity in. I would stay away from any kind of overhead heating and just go with a heating pad/under tank heating, it'll need to be hooked up to a thermostat to keep it from getting too hot, when you check inside the cage above where the heat pad is, you only want it to be about 82-84f.