MT Products Non-Squishy White Hard Polystyrene Foam Blocks - Made in the USA - MT Products
Amazon.com: MT Products Hard Foam Blocks (6 Pack) 4" x 4" x 4" Non-Squishy Polystyrene Craft Foam Cubes for Arts and Crafts : Arts, Crafts & Sewing
4 Pack Foam Cube Squares for Crafts - Polystyrene Blocks for DIY Projects, Models, Arts Supplies (6x6x6", White) - Walmart.com
Amazon.com: hand2mind Foam Blocks, Counting Cubes for Kids Math, 1 Inch Blocks for Preschool Crafts, Early Math Manipulatives for Preschool, Classroom Supplies for Teachers Elementary (Pack of 100) : Toys & Games
Shop Foam Blocks from HPFY [Hand Therapy Exercise]
12 Pack Foam Blocks for Crafts, Polystyrene Brick Rectangles for Floral Arrangements, Art Supplies, Holiday Decor (4 x 4 x 2 In, White) | Michaels
3x3x2'' Foam Cube Set of 6, 3x3x2 Inches Ornament Foam, 8x8x5 Cm Soft Foam Cubes, Square Styrofoam Cube, Polystyrene Foam - Etsy
30 Pack Foam Craft Blocks for Modeling, 3 Inch Mini Square Cubes for Sculpting, School Projects (White Polystrene) - Walmart.com