1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) - Walmart.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
Evergreen Scale Models 9009 White Sheet Styrene .005 x 6 x 12 (3 Pack) — White Rose Hobbies
MCS Polystyrene Sheets – Jerrys Artist Outlet
Evergreen Scale Models 19030 .030" x 12" x 24" Polystyrene White Sheet – Trainz