I bought chip board at a local craft store and I paid $.99 for each sheet My DH cut them in 71/2 x11 and then cut the left overs into 4 x 8. It was the cheapest way to go. I thought I had most of mine wrapped on the boards when I found a 30 gal. tote filled with material yuck. Have fun. Oh, I stored my on open book shelves. Happy organizing.