Here's a paragraph, from an old thread, with price of old CANBUS monitoring system, but I had some cabling, already. {You would want ISOBUS system, and not CANBUS system}

My records, showed I paid $2636, for that 2 channel CANBUS system with 4 row modules and 4 sensors. {Note: I already had 2 implement switches  (JD style ) on planter = required as part of Ag Leader STMM planter monitor, I installed one year earlier}

Previous thread:

http://talk.newagtalk.com/forums/thread-view.asp?tid=594756&mid=4926634#M4926634