fansace firm king size mattress, 18 inch deluxe hybrid king mattress in a box, cooling-gel memory foam & pocket springs, pressure relief, extra edge support, 365-night trial (2026 upgraded support) firm 18 inches king (u.s. standard) is up for auction in Home & Kitchen. The current bid is $41.00, 94% below the $699.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.