This Queen Size Sleep Innovations 12-in. Gel Memory Foam Mattress, originally $1599.99, can be had for a net price of $289.99 with free shipping after discount, rebate and cash back at Kohls.com. Add the mattress to your cart for $599.99 and apply code HOTDOG20 to drop the price to $479.99. After your order, you'll be sent a separate email with $90 in Kohl's Cash, which can be redeemed online or in-store between 9/3-9/15. Send in this mail-in rebate for $100, and your pretax total will come out to $289.99. That's the lowest price we found on any 12" gel memory foam mattress by $160. The mattress includes a 20-year manufacturer warranty. It is available in other sizes; the Twin works out to $239.99 net, the Full is $267.99, and the King or Cal. King is $389.99. Sales tax is charged in most states.