They both cost a friggin fortune. Do they ever show up second-hand?
My interest in them is for the cobza/koboz - eight wooden pegs attempting to hold a the lower 8 of a 12-string set. With difficulty. The only instrument I've tried that was anywhere near as difficult to tune was the Black Sea fiddle, and with that you can at least fit clip-on fine tuners. But a Peghed or Perfection set of 8 pegs would cost more than I paid for the cobza itself.