What are the speakers you very rarely find in the Used market(Audiogon or Anywhere)?

I'm looking for Vandersteen Quatro CT, Wilson Sabrina or DeVore Fidelity Orangutan 0/93 or 0/96. I rarely find it or in some cases, before I make an offer, it is gone. What other speakers are a rare find?
Back about a year ago my dealer had 3 pairs of Aerial 6's (one set was mine). All trade in's for the new T series. They were all gone in less than 2 weeks. If your into HT try to find an Aerial CC-3 or CC-5.
There’s a good chance that I will be selling my Vandersteen Quatro CTs within the next couple of weeks, for local pickup only. Stay tuned...