What type of service are looking for? there is generic service and there is FAA aviation specific service that needs to be done by FAA approved technicians.
Carefully searching second hand forums and sales such as eBay or Arfcom. If you take your time such as several months or a year you can build for way less but if you want it done within a month itll cost the same to buy new.
@@LukePRTR That's my experience as well. Also I just put my name into all of the night vision retailers for the price I want and after a few months or a year they call me back when their sales are slow to make a deal.