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3/8" White Acid Free Buffered Foam Core Boards : 32 x 40 - BOXFORLESS.COM
Amazon.com : AKOLAFE 30 Pack 10x8 Inch Foam Boards, 5 mm Thick Foam Core Board 1/5 Inch White Foam Sheet, White Polystyrene Poster Board Signboard for Presentations, School, Office & Art Projects : Office Products
2 Pieces DIY Sheets Foam Board Craft Model Building - White, 200mm x 300mm x 200mm x 300mm x 5mm - Walmart.com