Ed at Constrictors Northwest Constrictors offers white cages in a variety of sizes (including custom sizes). Excellent quality cages, reasonably priced and Ed is a great guy to do business with. The only downside, it looks like Ed is gotten so popular that he has a backlog of orders he's in the process of filling. If you can wait a bit I think you would be very happy with his cages.
Constrictors Northwest