Black Infinity Styrene Board - Pre-Cut Sizes (3/16") Multi-Packs
Amazon.com : Excelsis Design 15 Pack Foam Board 20x30 Inches | White Foam Board 1/8 Inch Thick White Core Mat | Backing Board for Presentations, Signboards, Arts, Display and Crafts with Double-Sided
3/16" Color Foam Core Boards : 40 X 72 - BOXFORLESS.COM
Amazon.com : Elmer's 900803 Foam Board, White Surface with White Core, 30 x40, 10 Boards/Carton : Office Products