You can buy some replacement balls here http://www.christoz.com/toys-and-games/2011/03/19/mindflex-game-replacement-parts-and-pieces-reviews/ It's actually a little pack of spare parts common for loss or breakage that includes 3 spines, 5 hoops, 2 cages, 2 vertical walls, 4 plates and 4 foam balls for just $16.95usd. Not so bad considering the unit new sells for about $75usd. A lot of vendors use to sell this package of replacement parts but most of them have stopped selling them.
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Your very welcome. Thanks for using FixYa.
Regards,
Tony