I get boards like these free at work so I don't have to buy them I don't have a size choice so if I need smaller than a standard paper size I cut them and if I need larger I buy foamboard at the dollar tree. I collect the boards all the time now its a running joke at work about throwing them out which is what used to happen to them. sometimes I have to use more than 1 but since theyre free its no big deal and I have a lot saved up for the future or for friends.
Carla m