Depends on how nice of a job you want to do and if you can make your own parts. If you can make stuff yourself you can put rear steer on it for the cost of a servo, couple bucks in hardware and would need a 3 channel radio.

I got my behind the axle steering setup finished last night and made my links. Also added aluminum knuckles to the front. The stock plastic ones were flexing way to much and I was losing a lot of steering. Next will be painting up a new lid