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Get this Slumber Solutions 4" Highloft Supreme Memory Foam Mattress Topper from $53.99 when you activate this link and check out as a new customer at Overstock. The Twin drops from $59.99 to $53.99, Full drops from $74.99 to $67.49, Queen drops from $89.99 to $80.99, and King or Cal King drops from $99.99 to $89.99. This is the lowest price we found for any similar 4" memory foam, and it only drops to this price on Overstock a few times a year (the Queen size is $150 on Amazon). Also, check out the 4.5 out of 5 star rating by over 3100 reviewers! It also comes in a 3" version from $45 with the extra discount. There is no sales tax (except UT).