Oh --- Makes sense! I am a bird fanatic as well ---
If you can try E.P. Levine at (617) -951-1499 in Boston MA USA.
Ask for Mike Bard and tell him I sent you from the forum. He just bought the place - the longest running shop in the city, and will continue to try and stock more Leica and other high end equipment as anyone in the Boston area. If he doesn't have it he will search for it.
Good Luck!