Archival Methods 1/8" Acid-Free Foamboard 82-2430 B&H Photo Video
Foam Core Backing Board 3/8" White 24x30- 5 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects - Walmart.com
3/16" Black 1 Side Self Adhesive Foam Core Boards :24X48
3/16" White 1 Side Self Adhesive Foam Core Boards :24x30
24 x 30 x 3/16 Black Foam Board 6 Pack | Pittman
Amazon.com : Union Premium Black Foam Board 24 x 36 x3/16" 10-Pack : Matte Finish High-Density Professional Use, Perfect for Presentations, Signboards, Arts and Crafts, Framing, Display (Black, 24 x 36 x
Elmer's Foam Board 3/16" X 24" X 36" Black-on-black 81242 : Target
24 x 30 x 1/2 Black Gatorfoam Gator Board 6 pieces-2430BGB.5