While not always in stock at every location, you can often find thin PVC sheets in the signage or building materials sections.
PVC foam board, often referred to by brand names like , Foamex , or Celtec , is available through specialized plastic suppliers, major home improvement warehouses, and various online marketplaces. Online Marketplaces (Best for Small Projects) where to buy pvc foam board
& Lowe’s : Look for "expanded PVC" or "PVC trim board." Note: These are often located near the siding or molding aisles rather than the lumber section. While not always in stock at every location,
: A reliable source for "off-cuts" or scrap pieces at a discount. is available through specialized plastic suppliers