Today only, all sizes of The Big One memory foam mattress topper drop from $79.99-109.99 to $34.99 to $29.74 with code SAVINGS at Kohl's. Shipping adds $6.95, or is free for orders over $50, post-discount, with code SHIP2U50. Even with the shipping charge, this is the best price we could find anywhere on a comparable memory foam mattress topper. The topper is available in Twin, King and California King sizes at this price. Full and Queen sizes are sold out. Sales tax is charged in most states.