Mikuni CV BS series parts sources

I've been getting more than a little nervous about parts supply for our old Mikuni CV BS series carburetors. This is not intended to rant but; it might be a good time to round up and list some of the better places a guy might hope to find more of the good, the right and the righteous places to purchase same?

I notice the older parts disappearing from various listings. Outlook and forecast supply
information could be pretty valuable ? Who if any are still making these? Blue

The best price on new choke parts for Mikuni BS34 (34mm constant velocity) that I was able to find is:
Dillon Bros Motorsports, Omaha NE http://www.powersportspro.com/
Carb Choke Springs YAM-583-14589-00-00 $7.35 each
Carb Choke Balls YAM-93501-08001-00 $0.69 each
Starter Lever Shaft YAM-361-14977-00-00 in stock
shipping was only $5, much less than most places
These prices and availability - September 2012
Mike's XS doesn't carry these parts, nor do most stores, these parts also fit 1980 Yamaha SR500

I tried using the grease zerk springs and balls, didn't work worth a crap on my 80 xs.