I have read that some have double them up with two layers and used them for cakes that are not too heavy.
I use 1 layer of foamcore board that is 1/2 inch thick. I love it for my tiered cakes, because when you use the wooden dowels for your support system with a long center dowel through the whole cake, you can drive the dowels right into the foam core board, and that sucker won't move at all.
I have found that here in Upstate NY foamcore sells for $5.99 at michaels ; a little more at ACMoore, and its cheapest at Hobby Lobby at $4.99, but I find that Hobby Lobby also has a 1/2 price sale on it every couple of weeks, so thats when I stock up on it!
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