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?
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Three_easy....yep I’ve been keeping my eye out for D7s or D9s for some time now, rarely happens. I think it’s because there just aren’t lot of them in the US, plus owners hang on to them. 
There have been a few pair of Wilson Sabrinas lately. Have only seen two pair of 0/96 in the past year, and one of those wasn’t here. A few more 0/93.. Two pair of JA Puslars popped up in the last month or so and were gone fast, and one of those was a realist. That pair of JA Pearl 3 had been on here a couple times in the past from the same seller, but at higher prices. Have seen just two pair of Quattro CT’s in about a year here. 
Dynaudio Special One. Not when they were young, not when they are a quarter century old.