Here is the link that works for locating the Hunter GSP9700 in your area. Seems like Big O is shown the most as well as some dealers. I guess in addition one should ask if they use the Haweka adapter. This discussion was a good heads up as I have always wondered about the differences in tire shops.
www.gsp9700.com/pub/search/findgsp9700.cfm
www.gsp9700.com/pub/search/findgsp9700.cfm