I'm looking at buying the Ara Memory Foam Mattress (made by Sleep Science) from Costco. Does anyone know if you need to buy a box spring separately? I'm confused as to whether it comes with a box spring or not?
ETA: This is the link to the mattress: http://www.costco.com/Browse/Product.aspx?Prodid=11307373
ETA: This is the link to the mattress: http://www.costco.com/Browse/Product.aspx?Prodid=11307373