Ikea MINNESUND Foam mattress, firm, white
http://www.ikea.com/us/en/catalog/products/30315876/
I bought this mattress only 2 months ago. It is are like brand new. the mattress always stays in a layer of protector.

orig price: $89+tax
asking for: I have two. $30 for each

Product dimensions
Length: 74 3/8 "
Width: 38 1/4 "
Thickness: 3 7/8 "

Length: 189 cm
Width: 97 cm
Thickness: 10 cm