16 Pack A3 Foam Boards AHUNTTER Black 5mm Polystyrene Foam Core Sheets Large Styrofoam Board for Crafts (297 x 420mm) : Amazon.co.uk: Stationery & Office Supplies
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 : Amazon.co.uk: