Looking at dealer pricing for the GTN series. they would be making about $1500 to $2000 without much installation. This is because Penn Avionics are quite large and can sell your old stuff at top dollar. Not sure what else you have but a G600 may be a better upgrade. If you have a Cheyenne III, IIIA or 400LS, Garmin and Jettech have come up with a dual G600 RVSM STC. Not sure if it's on their web site yet. Penn Avionics would be able to do that as well.
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