I think these are called 'babble balls' At one point in time, I bought some at Bed, Bath and Beyond in the doggie section. Lexi absolutely loves them. I put one in a sphere ball like thing that has holes to fit the babble ball into. A tight squeeze, but it fits. Then it can't roll under things and also bang against things. There are two tiny screws in it to unscrew and change the three batteries. I figured out which batteries to use and ordered those online because they are pretty expensive in a store. Like I said Lexi loves her Babble balls. You eventually get used to hearing the silly thing. Sometimes you just walk by and it shouts 'hey, what are you doing' or 'Na Na Na Na Na Na' |