I suggest that you contact Nancy Fratti <email@example.com> of
Panchronia Antiquities in Canastota, N.Y., about availability of extra
pre-punched tune strips for the 20-note Sankyo movement. She does sell
that item, which comes with 5 pre-punched strips, several blank ones,
a punch, and instructions.
Of course, the idea behind the kit is that you create your own tunes by
punching the blank strips. If you don't have the musical talent to do
that, it should be easy to hire someone to do it for you (at least the
arranging part; you could then do the dog work of punching yourself),
if you tell him the scale or gamme of the movement.
Matthew Caulfield (Irondequoit, N.Y.)