The Cessna 120-140 Association Forum

I have this listed on Barnstormers for $850 but if you are a 120-140 Association member it's yours for $800 + shipping. Its in excellent condition and was working well when removed for an upgrade.

Garmin GTX330 transponder

GARMIN GTX330 TRANSPONDER • OFFERED FOR SALE • Garmin GTX330 transponder (non-ES). Part number 011-00455-00. Includes tray. Excellent. $850 +ship • Contact John Von Linsowe, Owner - located Metamora, MI USA • Telephone: 810-730-4807 • Posted November 12, 2018

Very interested in this. Have you gotten a quote from Garmin as to what the fee is to update to the ES/ADS-B version?

No, I'm sorry I do not.

If you are looking at an ADS-b solution this may work well with the new uAvionix solution as is. (and others)