30 Pack White Foam Core Board 20 x 30 Inch Foam Core Backing Board Sheet 3/16 Inch Thickness Polystyrene Poster Board for Presentations, Signboards, Arts and Crafts, Framing, Display, Projects : Amazon.co.uk:
Foam Board, White, Matte, 20" x 30", 10 Sheets - PAC5510 | Dixon Ticonderoga Co - Pacon | Tag Board
20" X 30" Slate Gray Foam Board 25 Pack
10mm Foamboard White 20" x 30" Pack of 13 Sheets| Prizma Graphics