Jpi offers considerable savings on these durring Oshkosh and Sun-n-Fun, and some of the retailers mentioned above will give discounts on top of that. The install doesn't require an avionics shop at $125 hr. It's simple enought that it can be done by a local mechanic who is willing to read the manual and follow it, or many owners would be able to do most if not all under his supervision. I probably spent around 30 hrs upgrading from the 830 to 900 and a couple of the harnesses and several of the sensors were the same part number and reused. We had to run a new wire to the outboard fuel sender on both side which probably accounted for 6 of the 30 hrs. The 900 4-cylinders with 2 tanks were selling for $2895 last year durring Sun N Fun.