Up for sale here is an ARC RT-328T pulled from my plane for my panel upgrade. Radio worked fine when it was removed. Squelch knob needs a bit of tightening. You can find these on used avionics sites for in the neighborhood of 750$.
For sale here at 250$, OBO. Great as a backup/spare or add it as a second radio. I'll ship it or deliver it if you are close enough!