The Big One Cool Flow Gel Memory Foam Mattress Topper is at least 55% off at the early Black Friday sale at Kohls.com. Then use code ENJOY15 for another 15% off at checkout. The twin size drops from $74.99 to $33.74 to $28.67, the queen size drops from $109.99 to $40.49 to $34.41, and the king size drops from $119.99 to $42.74 to $36.32 after the code. A similar queen-size topper would cost at least $40 elsewhere. Shipping adds $8.95 or is free over $75, or you can buy many items online and choose free curbside pickup in select locations. Sales tax is charged in most states.