As of today, you can still get Garmin to refurb/repair the GTX 327b transponder. I just did one and my costs was $720.00 with a one year warranty.
I used a Garmin GDL-82 for the ADS-B that was purchased new from an owner that decided to go in a different direction. So all in all I am into this transponder with ADS-B for $1600.00.
