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
Amazon.com: evergreen 9008 White Polystyrene Sheet Set of 3 : Arts, Crafts & Sewing
1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) - Walmart.com
Polystyrene Sheet, White - 12.7mm Thick (1/2 Inch) x 25cm Square - Radiation Products Design, Inc.
Polystyrene Sheets - 10 x 10 x 1" S-19393 - Uline
Amazon.com: ABS1705 10pcs 0.5mm Thickness 170mm x 250mm White Polystyrene Sheets 9.84'' x 6.69'' ABS Styrene Sheets for Model Train Layout (0.5mm-10pcs) : Arts, Crafts & Sewing
Amazon.com: DNB Craft Foam Board - 6PCS 17X11X1 Inch Polystyrene Rectangle White Thick Foam Sheets - Crafts and Arts Supplies : Arts, Crafts & Sewing