Some stores that sell jumbo polymer balls include Incredible Science and Online Science Mall. Customers can also find jumbo polymer balls on Amazon.com. These jumbo polymer balls expand when placed into water.
Some jumbo polymer balls from Incredible Science include glow-in-the-dark balls and giant eyeballs. The website also sells light-up polymer balls and spider balls with many polymers attached to each other. Online Science Mall sells a pack of rainbow beads, while Amazon.com sells clear beads. Both of these sets expand to 200 times their original size in about one day. When they dry out, they return to their original size.