We can do our own Juggling Balls with just 2 ballons and a little bit rice, really cheap stuff.
1. With a funnel, put the rice inside the balloon. The size of your juggling balls depends on the amount of rice you use. You should hold two balls in one hand at the same time, and not to small, otherwise will be more difficult for you later.
2. Cut the neck off the balloon.
3. Cut the neck off a second balloon and stretch it over the hole to seal the rice into your juggling ball.
4. Just if you want, you can cut lots of very small holes in a third balloon by pinchingt it between your finger and thumb and carefully cutting off the tips - remove the neck and stretch over a ball to make spotty patterns.
Good luck and enjoy it!