Amazon.com: Juvale 100 Pack 1-Inch Polystyrene Mini Foam Balls for Arts and Crafts, Easter Decorations, Home Party, Classroom Spheres : Arts, Crafts & Sewing
Amazon.com: Foam Balls,12 Pack Foam Ball Smooth Polystyrene Foam Balls Foam Balls for Arts and Crafts, Sculptures, Floral Arrangements, Modeling (2.8 Inches) : Arts, Crafts & Sewing
Styrofoam Ball & EPS Foam Balls by Shape Innovation, Inc.