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?
Ag insider logo xs@2xkarurravi
Any mbl speaker.
Any music culture speaker.
Diapason rarely but have seen 2 pair in 4 yrs. 
Just buy them next time they pop up and don't wait around making offers. Others are just buying them for the price listed and might be the price you have to pay for rare used speakers. I did that with a pair of 0/93's