Serta Perfect Sleeper Hybrid Standard 12" Twin XL Mattress - Firm, Cooling Gel Memory Foam, Pocket Innersprings for Motion Isolation, Edge Support, CertiPUR-US Certified - Pacific Peace Standard 12" Firm Hybrid Twin XL is up for auction in Home & Kitchen. The current bid is $151.00, 77% below the $657.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.