This toy is no longer available on the Ruffwear website
but I found one in a small pet supply store. It's still available in some on-line stores as well eg.
http://www.thecleverk9.ca/zoing.html
Nukka gives it 2 paws up when she's still looking to play after wearing the big dogs out
.
http://www.youtube.com/watch?v=bQ-t2cd1iaI