Summary: Brand - Slumber Solutions, Price - $400 Slumber Solutions Signature 14-in. NRGel Memory Foam Mattress Firm, 8-months old, no stains, with mattress protector, and 2" king-size mattress pad with one stain that you can have if wanted. 3 months after purchasing the mattress I suffered a back injury and have been unable to use the mattress. Mattress New $850.00 Price reduction $400.00.