One more vote for Sleep Number. I purchased the queen bed when it was on sale. It was the mattress only and I couldn't afford the bed also. So I got a box spring from my sister, put a board from Home Depot on top of that (covered with a piece of batting and cheap cotton sheet). Then put the mattress on top of that. I also had a 3 inch memory foam topper left over from previous bed, so put that on top. It took quite a while (like 6-9 months) to find my perfect number (40). But I sleep like a rock and wake up feeling great each morning.