Corrugated Cardboard - Pack of 12
Corrugated Cardboard is probably the least expensive material for prototyping. This is plain old corrugated cardboard -- basically saving you the trouble of scrounging it from some big cartons. Laser cutting cardboard is no problem.
We sell cardboard in a package of 12 sheets. Each sheet measures 20 inches by 36 inches. We sell corrugated in ⅛ and ¼ thickness.