Rather than purchase a new futon I decided to try replacing the mattress. After shopping around, I landed at wayfair.com and settled on the 9-inch full premium mattress. I have not been disappointed. It is thick and firm but very comfortable. I would purchase this mattress again and highly recommend it. My only disappointment was that all 9-inch full premium mattresses that wherein sale at 30% off were out of stock so I had to pay full price--definitely a nice mattress though.

Pros: Firm and comfortable, free shipping.
Cons: All on sale colors were out of stock.