At the bottom of the main Marriott page you will see a link which says Shop Marriott. It contains all the information you're asking. I've attached the link below: http://www.shopmarriott.com/index.aspx
I bought my bed from a place called Good Morning Mattress Center - They have the same bed that's in all the Marriott but with a better price. The difference is the cover, but the construction of the mattress is exactly the same.