This deal has ended.
As part of their Red Line Deals, Overstock marks down the Eco-friendly 1.5-inch Memory Foam Mattress Topper, from $47.99 to $42.99. With $2.95 shipping, that's the lowest price we've seen to date. It is available in twin, twin xl, full, queen, king and California king for this same price. It is well reviewed, with 4.5 stars from over 310 buyers. There's no sales tax (except UT).