Ghostline Faint 1/2" Grid Foam Board Chart, Wood, Graph, Decoration, Home, Art, Office, Craft, School Project Mounting, Display - 22" x 187.5 mil x 28" - 5 / Carton, Polystyrene, Easy-To-Cut Design - Walmart.com
1/2" Foam Board - Irvine Printing & Displays
Elmer's, White Foamboard, 1/2" x 48" x 96", White - Sam Flax Atlanta
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