Amazon.com: Flipside Products - Large White Foam Board, 30" x 40", 10 Pack, 5mm Thick : Office Products
40 x 60 x 3/16 White Fome-Cor Board 25 Sheets-WFC4060-25
Blackcore Foam Board - 40" x 60" x 3/16", Black, Single Sheet | BLICK Art Materials
Amazon.com : Union Premium Foam Board 30 x 40 x 3/16" 10-Pack : Matte Finish High-Density Professional Use, Perfect for Presentations, Signboards, Arts and Crafts, Framing, Display (White, 30x40) : Office Products