Mike, you can get it at most craft store's or go to a bed outlet, a lot of time's they have scrap's that you can get. Weight, you can stuff quite a bit in there and you would have to fill and find what feel's comfortable for you. Maby stuff a weighted object in with the memory foam for extra balance. some of the other member's got some local's where they get their memory foam, what do you say guy's.? Ed