We just upgraded the foam in our 73 Argosy. The Foam Store is right here in town so we availed ourselves of their service. 5" of high density foam topped with 2" of memory foam did the trick. Very comfy. $230 Canadian /each with zip on mattress covers included. Really nice covers BTW. Our $ is currently hovering around .80 USD so $200 should cover it. Check it out at thefoamstore.ca They ship.