I see these on EBay and Craigslist sometimes. There's a dealer in Southern California that often has several of them. They go for a lot of money! (They're a very nice bike!) but at least you know they've been well cared for.
Once in a while you'll see one at Rider's Choice in Sunnyvale. That's a big indoor consignment lot where people leave bikes for sale. If you're down that way you might stop in there just to see what they have.
