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
Foam Core 4′ X 8′ X 3/16″ | Hollywood Expendables
White Foam Board (Standard Sizes) - Columbia Omni Studio
Amazon.com : Pack of 25 11x17 3/16" White Foam Core Backings : Office Products