They've got that heavy (20 gauge) clear plastic at Jo-Ann Fabrics. I got some to make a wee greenhouse out of a plastic shelf unit. Usually Jo-Ann's has a monthly mailer with specials and coupons, but I don't get it, so I asked at the register if there were any specials on, and the guy gave me 50% off; it came out to ~$4/yard, at 54" wide.
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