That "police trade in" and the Mossad model mentioned above probably came through the same pipeline... as doubt that any Tanfoglios were ever used by a police department in the U.S... (It's possible, but it would almost have to have been in a very small department where LEOs were allowed to use about anything they wanted.)
The Tanfoglios are similar to the small-frame Witnesses that were available new until just a few years ago from EAA -- about the only differences being where the safety lever was located on SOME models. (EAA has since gone to larger frames with all their CZ-pattern guns.) From $300 - $350, for a Witness or Tanfoglio in very good shape is not unusual; if it's a beater, I'd probably just wait for one that's nicer. More than that, and I'd pass.
I don't know how easy parts might be -- but I think that EAA can provide most things you'd need, as the Witness line is built by Tanfoglio.