Amazon.com : Foam Board 20 x 30 x 3/16" (5mm) - 12 Pack - White Poster Board, Acid Free, Double Sided, Rigid, Sign Board Foamboard for Mounting, Crafts, Paintings Prints, Art, Display,
Readi-Board Foam Board Bulk Case 50
Foam Core Board - 1 sheet (4' x 8')
Amazon.com: Foam Boards White Foam Core Backing Boards, Silver Craft Knife with Protective Cap and 12 Inch Stainless Steel Ruler for Art Presentations Crafts Display Favors(White, Silver, 12 x 10 x 0.2
White Foam Board | BLICK Art Materials
24x36 White Foamboard 3/16" Thick - Sam Flax Atlanta
Artcare FoamCore Board | TALAS
Artcare Archival Foam White Board
Foamboard and Paperboard Material for Signs - Polymershapes