I have a Garmin GPSMAP 295 and I'm looking to upgrade. I have the extra dash antena and the 12 volt cigarette charger plug. Also have the computer interface to update the maps. Garmin still supports the unit with software updates. I bought the last one 6 months ago.
https://buy.garmin.com/shop/shop.do?pID=135
Not sure what it's worth but would like to get $500. Make me an offer if you think I'm asking too much.
I can be reached at jrupert@lycoming.com or jlr262@yahoo.com