Amazon.com: 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(White, Silver, 12 x 10 x 0.2
12 x 12 x 1/2 White Gator Board 21 pieces cut exact
PVC Foam Board - White - 1/2 inch thick - various sizes – Falken Design
Foam Core Cake Board Round White, 10 x 1/2 Inches, 4 Count by Global Sugar Art Foam Core Boards