Ok...here is my idea, when at a fabric store, Joann, Hobby Lobby, LQS, I ask them if they have any empty bolts that I may have for free.....when I get home it takes a modest amount of time using a box cutter, to cut them to size. I cut off the ends where the label is, one side is already cut, and then just have to cut the other side in half. So from one bolt, I get 4 1/2 bolt cardboards....they are perfect and FREE