How much is a Trimble autopilot kit for an MX series tractor?

Also, can you run Autopilot on 2wd 71,72, or 8900 series tractors? How much would that cost?

Have an Insight and EZ 500 looking to get into rtk for next spring and trying to figure out the best (cheapest and/or easiest) way to make it happen. Thinking prolly EZ steer is the best way to go right now, but want to hear what you guys all think.

btw, I don't care for the price of the base station, etc, will be running off the CORS network.

Thanks!