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Old 11-28-2008, 05:07 PM   #2 (permalink)
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The cheapest source for corrugated plastic (coroplast) is harvesting campaign signs after election day. It's a bit late for that this year, but you can buy sheets from sign shops. Some people have also had success finding them at home improvement stores like Home Depot. Prices seem to vary, but people have reported in the $20 range for a 4' by 8' sheet.
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