I'm in the UK so can't help you with where, but we had one last year and it was brilliant - we attached a strap to the back of it, so that if Katie wandered too far we wouldn't lose her and that worked really well, much better than a traditional wrist strap which she really hated.
In fact, we have 2, one came with the strap and the other was a freebie with a kids sized suitcase, so they must be fairly readily available.
Bev