What store can I go to, to buy corrugated plastic sheets?

I would like to buy some of the sheets, but would like to go get it from a store and not have to wait for it to be shipped. Do they sell it at home depot or something?What store can I go to, to buy corrugated plastic sheets?
I know Lowes sells them adn I'm pretty sure home depot does too.What store can I go to, to buy corrugated plastic sheets?
I'm trying to make yard signs out of the corrugated plastic instead of paying to have them made. I didn't know where to look, but Lowes actually has a kit that includes the plastic sheet and a frame for it for $6.

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home depot, lowes, menards, or just about any building supply store
our home depot sells them. also try Tap Plastics if you have one near.
I'm almost certain that all homecenters carry material used for things like roofing a carport. They probably carry it in clear and just about every color.
GEEZ THEY'D BE UNCOMFORTABLE BY MORNING -WOULDN'T THEY