Brand new (unopened) 5-zone mattress topper (Twin-XL) for $5
Great quality - I used one like this in a different size in a previous apartment to cover a too-firm mattress. It was very comfortable!
Bought this one 1 month ago but never opened, since my current mattress didn't need it.
Paid $9.94, asking $5
(http://www.walmart.com/ip/Mainstays-1.25-Convoluted-Foam-Topper-Twin/10055840)