Golden State Art,Pack of 200, 8x10 White Foam Board Backing 1/8" | Golden State Art
Foam Core Backing Board 3/8" White 18x24- 25 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects - Walmart.com
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