I went to the Dollar store and they had the foam core boards, then when they ran out I went to a local sign board and purchased the coroplast boards, I cut all the larger boards into smaller more convienient sizes, I do am on a budget, but if I buy some, then go get some more, it works out better and it doesn't seem as if I'm spending all that much money at once, buy the way, I get twice as much in my space by storing my fabric in this way