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Call the local Home Depot and ask if they have it. Ask for corrugated plastic. Nobody here knows what coroplast is... even the sign shop.
If they don't carry it in their store, ask them where the closest one is that does sell it. I know the Home Depot closest to me doesn't sell it, but there is one a few citys over (it's like a superstore or something special, idk...) and they sell 4x8 sheets for $20.
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