Originally Posted by PaperPrincess
I get left over sign material. Some of it is solid plastic, some have 'channels'. Go to your local sign shop and ask if they have any scraps, usually inexpensive, sometimes free!!!
I agree, this corrugated plastic that they use for election signs etc. is very light and sturdy. I cut it with an old rotary cutter. I got an armful of scraps from my local sign shop for $10