Komatex 24 in. x 36 in. x 0.118 in. Black Foam Project Board (5-Pack) 41655106 - The Home Depot
Buy White 3/16" Foam Core Permanent Adhesive 36" x 48" Mounting Boards - 25pk (550461)
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Elmer's® Tri-Fold Foam Display Board - White, 36 x 48 in - Harris Teeter
Flipside Products 36 x 48 White Foam Project Board Bulk, PK10 30048-10 | Zoro
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Amazon.com : Frienda 10 Pcs Foam Core Board 36 x 48 Inch Large Corrugated Plastic Sheet Acid Free Foam Poster Backing Board Large Black Polystyrene Board Bulk for Art Crafts School Projects