Jim,
i bought both of my Units off ebay years ago. Now they ask crazy prices for them.
i run a JR 9503 in the cable Hoe and with JR & Spektrum you can bind multiple rx's to one radio at the same time. So, i have a separate battery, rx and power switch in the undercarriage.
i use these $6 rx's from hobby king:
http://www.hobbyking.com/hobbyking/s..._Receiver.html