http://www.powerbulbs.co.uk/
Click on the american flag and you can buy them in dollars
~$35 or so for the OSRAM Silverstars.
(If you dont like eBay, or like real companies for some reason)
(Any ideas on the blue OSRAMs?)
Just found this place in CA:
http://www.casporttouring.com/thestore/osram.html