I bought some Coroplast last week for about $13.60 per white 4x8x4mm sheet. Closer to $17 for colors. I first called a number of sign shops, because they use the material for signs, and I was hoping to recycle some old signs, but nobody had used stuff, so I asked them where they got their materials. A few different sign shops gave me some contact info on a few different suppliers, and the place I ended up buying from had a lot of different sheets of a lot of different materials, but they seemed to deal mostly in raw materials for sign makers. Look under signs and plastics. Good luck!
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