Ending today, Macy's offers the Martha Stewart Essentials 7-Zone Memory Foam Mattress Topper in a selection of sizes, with prices starting from $21.99. Opt for in-store pickup to avoid the $9.95 shipping charge. That's a savings of between $43 and $62. It's available in Twin, Twin XL, Queen, King, and California King sizes.
One grocery chain is likely to save you more money than any other.