3/4 in. x 1.25 ft. x 4 ft. R-2.65 Polystyrene Panel Insulation Sheathing (6-Pack) 150705 - The Home Depot
Amazon.com: AMZQNART Craft Foam Blocks, 1 in Thick 17x11" EPS Polystyrene Rectangle Foam Blocks Packs of 7 Pcs for Art Sculpting, Sculpture, Modeling, School and Home DIY. : Arts, Crafts & Sewing
RIGID SQUARE EDGE FOAM SHEETS - Foam Mart
Juvale 100 Pack 1-inch Polystyrene Mini Foam Balls For Kids Arts And Crafts, Home Party, Small Classroom Spheres : Target
Craft Foam 101: The Different Types of Styrofoam and Uses Explained - YouTube
STYROFOAM R-4, 0.78-in x 8-ft x 4-ft Residential Sheathing Faced Polystyrene For Use In Garage Doors Board Insulation Sound Barrier in the Board Insulation department at Lowes.com
Amazon.com: Juvale 1-Inch Thick Foam Rectangle Blocks for Crafts, Diorama Supplies, Centerpieces, School Projects, Packaging, Polystyrene Boards for DIY Sculpture (12x4x1 in, 12-Pack) : Arts, Crafts & Sewing