Juvale White Polystyrene Foam Block for Arts and Crafts, 20 Pack, 10.2 x 10.2 x 5 cm : Amazon.co.uk: Home & Kitchen
6 Pack Foam Blocks for Crafts - Polystyrene Brick Rectangles for Art Sculpting, Flower Arrangements, Packing (20 x 10 x 5 cm) : Amazon.co.uk: Home & Kitchen
YOUEON 12 Pack Rectangle Foam Blocks 8x4x2 In/20x10x5 cm Craft Foam Square Blocks Hard Foam Boards Styrofoam, Dry Floral Foam Bricks for Arts and Crafts, Floral Arrangements, Modeling White : Amazon.co.uk: Home
GeoFoam America, buy made-to-order foam blocks and EPS foam
6 X 6 X 6 Foam Pit Cubes Blocks for Gymnastics - Etsy UK