Omega

Is the white gold central tourbillon easy to obtain?  My local dealers have the usual (common) stuff, but no "exotics".

. . . that had three Omega center tourbillons recently, one of them in white gold . . . if you have the cash, you can walk out the door with my dream watch.  My compliments on your exquisite taste . . . cordially, Art 

...and as well many ADs can often order most any model if you commit to a purchase.

. . . my apologies . . . the three center tourbillons were a yellow gold/sapphire back, platinum/platinum back, and a platinum skeletonized/sapphire back.  As Ryan says, an authorized dealer can order one, but if you want to kick the tires and take a test drive I believe there are only two retail establishments in America that have them on display.  Cordially, Art