What are you looking for? Where?

What are the "recommended models"? Are you sure you're aren't ignoring some good bikes just because it wasn't on the top of someone else's list?

Also, are you racing, requiring cutting edge technology, or just a casual rider that likes something nice?

I see a lot more used 9s and 10s bikes for sale than 11s. Also more cantis than disc brake road/cross bikes.

My guess is that with the technology shifts, people buy and hold onto the "new" models, while dumping the "old" models.

One option, of course, would be to build your dream bike up from a mix of new and used parts.