Cost of Ipod connection

Hello* I would like to add an I-pod to end the chaos with the many CDs. Does one know what it costs to have an ordinary connection to the HU 650 installed. I have read in the previous forums that it is best to run via a USB port so that the playlist of the Ipod is visible in the radio display and can be controlled via the radio or steering wheel keys. Does one know what the installation of a good adapter costs and where it can be done best? A nice rest Sunday