Where to buy tennis balls with strings on them?

Question

Does anyone know where to get those tennis balls with strechy strings attached to it? I've heard it's available from Gamma Tennis Trainer. But I need to know if they sell it anywhere in Square One (doesn't have to be from GammaTennis Trainer though). Please be specific, like in what store and lower or upper level. Thank you.

Answer 1

Tennis balls with strings on them! Never heard of them before ! You know what i think they might be balls with a elastic which bounces back after u hit them.and then u again hit them

Answer 2

I know you can find them at d**k's Sporting Goods stores.

http://www.dickssportinggoods.com/produc...

But I don't know what you have at Square One.  

Here's one I found at midwestsports.com:

http://www.midwestsports.com/unique-tenn...

and at tenniswareshouse.com:

http://www.tennis-warehouse.com/descpage...

http://www.tennis-warehouse.com/descpage...