I have not been able to source one of these locally, and no gym I have attended has one either. All the products online look like cheap toys, and reviews seem to back this up.
I think this is a great exercise. Is there some horrible publicity I am missing that causes these not to be on shelves or in gyms? Can anyone suggest a good product to buy on the internet?
Edit- I should add that I am looking for a hand-held style.