You can generally pick one up for ~50-70 on ebay these days. Personally, I'd hunt for a model 102 or 200 (200 has more lines to work with).
Some "hinks" with it is the 40 col display. Most things are worked up for an 80 col display. There's also some missing keys, and you need to play with the term settings, especially if using it like myself: As a serial terminal on /dev/ttyUSB0 :)
Excellent - which is what it'll be used for.
I have a KPC-3 and a KPC-9612 in the stash. Only thing missing is a mobile terminal and cables to connect the TNC to my HTs.
That, and the lack of nodes in the area. :(
"Everyone wants to be an AM Gangsta until it's time to start doing AM Gangsta shit."