PlushBeds.com

Cal King — $400.00
It's called a "foundation" because it gives your mattress the right base as well as height. Unlike a traditional box spring, the Plushbeds™ Orthopedic Foundation is constructed of sturdy plywood and covered with attractive heavy-duty fabric. Pair it with your choice of any Plushbeds™ mattress, and you have the perfect combination for a splendid night's sleep.