I see the seller of the M400 is also selling tapes. (ebay 170235479076)
Not the entire frame, just individual tapes. Buy it now for $50 each tape, in case you are just hapening to be missing a certain note of a String/Flute/Sax tape (a common combo which everyone has, I'm sure. Oh yeah, which String or Flute or Sax are we talking about?) Only 2 missing tapes. That makes $1650.00 for all 33 of the tapes. The frame and case are not for sale.
Talk about a shot in the dark.
-Bruce D.