doi why didn't I think to ask you first..oh thats right..Im a retard. I'm not sure how many I need but definetly not a hundred..I was gonna ask at michaels what they would charge but figured I'd ask here first. I could use some backing board too..I have smaller 20x30 acid free foam board but the moth piece needs something bigger that that... I'd really appreciate it *teases you with her juicy pickle*