Amazon.com : Union Premium Foam Board 18 x 24 x 3/16" 10-Pack : Matte Finish High-Density Professional Use, Perfect for Presentations, Signboards, Arts and Crafts, Framing, Display (White, 18x24) : Office Products
3/16" Black Buffered Foam Core Boards :18 X 24 - BOXFORLESS.COM
18" x 24" Foam Board Rectangle Signs – Cdesigns Print
Create Your Own 18" x 24" Square Foam Core Board | Zazzle
3/16" Black 1 Side Self Adhesive Foam Core Boards :18X24
Create Your Own 18" x 24" Square Foam Core Board | Zazzle
Amazon.com: Golden State Art, Pack of 10, 1/8" Thick, 18x24 White Foam Boards (18x24, White) : Arts, Crafts & Sewing