Amazon.com: Silverlake Craft Foam Block - 3 Pack of 11x17x2 EPS Polystyrene Blocks for Crafting, Modeling, Art Projects and Floral Arrangements - Sculpting Sheets for DIY School & Home Art Projects :
Kay Metzeler (Super Plus 70) Expanded Polystyrene Insulation Board - 1200mm x 600mm x 50mm | Wickes.co.uk
Polystyrene Sheets - 48 x 96 x 1/2" S-15693 - Uline
Extruded Polystyrene vs. Expanded Polystyrene (XPS vs. EPS) - What's the Difference? - UltraBoard