R-Tech 1 in. x 48 in. x 8 ft. R-3.85 Insulating Sheathing 320821 - The Home Depot
1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) - Walmart.com
Black Sintra PVC Foam Board Plastic 1/4 6 Mm Thick 24 X 48 - Etsy
Amazon.com: 1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) : Arts, Crafts & Sewing
Expanded PVC Foam Board, White, 1/32" (0.078", 2 MM) Thick, 12" w x 12" L (Pack of 8): Amazon.com: Industrial & Scientific
Foam Board White 24"x36" - 1/8" Thick (25)
Amazon.com: 1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) : Arts, Crafts & Sewing
Sibe-r Plastic Supply White PVC Foam Board Plastic 1 Mm Thick Pick Your Size - Etsy
PVC Foam Board - Black - 1 inch thick - various sizes – Falken Design
Amazon.com: AMZQNART Craft Foam Blocks, 1 in Thick 17x11" EPS Polystyrene Rectangle Foam Blocks Packs of 7 Pcs for Art Sculpting, Sculpture, Modeling, School and Home DIY. : Arts, Crafts & Sewing
Buy 5" x 5" Total Black 3/16" Thick Foam Board Square Sheets - 48pk (FS-20486)