Polystyrene Sheet, White - 6.35mm Thick (1/4 Inch) x 25cm Square - Radiation Products Design, Inc.
50 pieces - 25 1/4" x 42 1/4" and 50 pieces - 23 1/4" x 33
4x6 Foam Board 1/8" - Shop Now
Generic Foam 321260 4x8 1 In White Foam Board at Sutherlands
Amazon.com: 8 Pieces Foam Boards White Foam Core Backing Boards, Silver Craft Knife with Protective Cap and 12 Inch Stainless Steel Ruler for Art Presentations Crafts Display Favors(12 x 10 x 0.2
Foamboard - White/White - 4' x 8' x 1/2" - Set Shop NYC
PVC Foam Board - White - 1/4 inch thick - various sizes – Falken Design
Black Sintra PVC Foam Board Plastic 1/4 6 Mm Thick - Etsy Sweden
Amazon.com: Expanded PVC Foam Board, White, 1/4" (0.25", 6MM) Thick, 18" W x 48" L : Industrial & Scientific
White PVC Celtec Foam Board Sheet 24" x 48" x 6mm / 1/4" (.25") Thick (Nominal) | eBay