I've got so much art that I need a display technique. I've discussed the method Larry use at the conventions with the bag attached to the foam board that can then be rotated in easel and display bin...Where's a good source for clear but firm bags/sleeves and a good price for board? Some of the foam board prices I was finding are like $8 to $10 each and with over 100 pieces to mount that's a chunk of change...Any advice?