Elmer's Foam Board, 20 x 30 inches, 3/16 inch Thickness, White, 1 Count - Walmart.com
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Hunt 20''x30'' Foam Board (10 sheets)
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Amazon.com : 30 Pack White Foam Core Board 20 x 30 Inch Foam Core Backing Board Sheet 3/16 Inch Thickness Polystyrene Poster Board for Presentations, Signboards, Arts and Crafts, Framing, Display, Projects : Office Products