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Amazon.com : Foam Core Backing Board 3/8" White 24x36-100 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects : Office Products
Amazon.com: Mat Board Center, Pack of 25 Foam Core Backing Boards 1/8" (11x14, White) : Office Products
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Viewpoint Acid-Free Black Foam Backing 8x10", 1/8" Thick 5 Pack | Jerry's Artarama
