Acid-Free Foam Core Boards - Artist & Craftsman Supply
SALE * 1/8"ACID-FREE - Custom Cut Foamboards - PRECUT FOAMCORE MOUNT BOARDS - Foam Core - Foam Board Sheets
Amazon.com: Jerry's Artarama Acid-Free Foam Board Sheets for Artists and Framers 8"×10" (3/16" Thick), Box of 25 - Ideal for Mounting and Cutting, White Foam Poster Board, Foam Core Board - White :