Are you wanting the 700 series green or red? I dont know about a rock tooth version. Greens website says the green tooth is good for rocky soil conditions and red is for less rocky conditions. It looks like you are in Minnesota here are the two dist in that state.
Minnesota
Roto Chopper 217 West St. Saint Martin 56376 320-548-3586
Trenchers Plus 2309 W. Hwy 13 Burnsville 55337 952-890-6000
Scott