We bought a memory foam bed and love it. They don't sell double pillow top mattress's around here. In the past we had two and they lasted many years. I guess the manufacturers decided to stop making them so we would have to buy more often. The one we replaced had a pillow top on one side and was lousy after six months of use.
We bought a memory foam topper and made sleeping on it possible. We still use the topper on the new bed to make it higher and easier to get in and out of.
Good luck with your purchase.