I have two dog beds that I got for free. Both are in very nice condition, but I had to pitch the foam insert in one due to it smelling so bad, and I need to replace the polyester fill in the other due to it also smelling. So, I'd like to pick up some foam (or polyester filling) to replace what I had to throw away, and a bed isn't really a bed without cushion. LOL Hobby Lobby has foam, but it comes in little blocks and I'd like to be able to just cut something down to size to fit what I need instead of putting multiple blocks in one bed. Should I just buy a mattress topper and cut it down to size? I was thinking something like this: http://www.walmart.com/ip/5-Zone-2-Convuluted-Foam-Topper/15581041?findingMethod=rr or this: http://www.walmart.com/ip/Beautyrest-Bed-Bug-Resistant-Memory-Foam-Topper/19589823 Or is there another place I can buy foam/polyester filing for cheap? I know Dr. Fosters&Smith sells refill polyester filing, but for the price of two pounds I could buy a mattress topper.