Eastern Avionics sells reconditioned transponders at
http://www.avionix.com/xpndr.html so you could get an idea from that.
Tom Cummings

"PaulaJay1" wrote in message
...
I'm installing a GTX 330 in my Archer in a couple of weeks so the KT78A
will be
removed. The shop doing the work is offering me $200 but it seems to me
that
it is worth more than that. Comments welcome.

Chuck