Not sure how many assails they are as they were discovered before tracker, probably in single digits though.
I know there's only 2 bashers ingame. One was owned by garco but not sure if he still has it. I bought one from auction a couple month back (may have been garco's, I didn't see who was selling it). When not in use I put it in my shop window, although as I use it I don't put a low price on it.