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Next time you are at Lowes, go to the garden department and look at the boxes the products are in.
Nearly everything is coroplast .
If you ask nicely and come at the right time ( as the product sells out ) you can get the stuff free.
It all goes in the dumpster.
Another option is to go to stores and look at their signs for sales.
Nearly every stand up sign is made from coroplast.
I got several of them free. I noted the day that the sale was ending and picked them up early before they went in the dumpster.
I have several sheets around 3' x 5' , and some even larger.
I would make sure the signs are away from high heat, since I'm not sure of the fire resistance of the ink on the coroplast.
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