Amazon.com: Shape Innovation - Smooth Molded Foam Ball - 10 Inch Diameter White EPS Sphere : Home & Kitchen
Amazon.com: Mega Crafts White Poly Craft Foam 10 Inch Ball, Durable, Solid Polystyrene Balls for Arts & Crafts, Ornaments, School Projects, Knitting & Party Favors, Great for Kids, Teachers & Artists :
Foam Balls Bulk - 10 Pack Large White Polystyrene Foam Ball for Arts and Craft Use, Makes DIY Ornaments, Science Modeling Projects, 2.75'' 7cm - Walmart.com
Foam Spheres 10" Diameter (12 Per Case) - All Floral Supplies