Barneys New York/Copley Place (Boston) also had one. I would also try the following:
1) Browns Fashion (London, UK)
2) Harvey Nichols (UK - London, Edinburgh, etc.)
3) Selfridges (UK)
4) Matches (London, UK)
5) Sugar (Arezzo, Italy)
6) Luisa Via Roma (multiple stores in Italy)
All of the above sell authentic merchandise. I'm still looking for the Bouton d'Or Part-Time with the old hardware (and more importantly - has the leather that I like!!).
GOOD LUCK!!!!