where to get stability ball?

What are the size of those stability balls that Cathe uses? I went to Target to look and there seemed to be a couple of different sizes. Am I crazy, or are there different sizes? I know that 65 cm was one of them, but I wasn't sure if that's the size that Cathe uses in her workouts.
 
Cathe uses a 55cm ball. I just got mine at Target yesterday. They had a sale on Pro Fit balls. How tall are you? I'm 5'2" like Cathe so I'm using a 55cm ball but if you're tall, you should get a 65cm ball.

Marcy
 

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