King Size Mattress, 12 Inch Deluxe Hybrid King Mattress in a Box, Medium Firm Mattresses with Gel Memory Foam & Pocket Springs, Pressure Relief, Cooling, Extra Edge Support [Upgraded Support] Black 12.0 Inches King (U.S. Standard) is up for auction in Home & Kitchen. The current bid is $110.01, 67% below the $330.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.