Until 3pm CST Saturday, The Big One Gel Memory Foam Mattress Topper in any size drops from as much as $109.99 to $39.99 to $31.99 when you use the code MAYFF20 at checkout on Kohls.com. Shipping adds $8.95 or is free when you spend $75. This is the lowest price we found for this memory foam topper in any size. Choose from Twin, Twin XL, Full, Queen, King, and California King. It features a sculpted design with 1.5" peak thickness and three-pound density. Sales tax is charged in most states.