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Foam Core Backing Board 3/8" White 24x36- 25 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects - Walmart.com
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Amazon.com: MBC Mat Board Center, Pack of 10 Acid-Free Foam Boards, 11x14 inch White Foam Boards, 1/8" Thick : Office Products
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