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

  I see O'93 pretty regular on Audiogon...Rarely O'96.  I happen to have O'96's still sitting in their crates in a custom color you've never seen...Guess I would describe them as a Honey/Butterscotch color with a Quartz/Burl finish. I also have Audio Note SPX Al Nico's which are so similar to the O'96's that I could part with the Devore's. If interested send me a PM and I can send photos. They certainly wont be cheap as the color was a 1500 upgrade.

Gershwins tend to be rare and ephemeral when they do appear. Same with Trenner and Friedl. Yes, there's a pair of the latter available on Agon now, but that seems to be an exception.

Any model from Joseph Audio ... people tend to keep ’em.

You can find plenty of Joseph Audio Pulsar's available but finding the Pearl's/Perspectives are tough. Was recently a pair of Pearl 3's here on Audiogon and they were snatched up in 2-3 days for 18K.

You don't see a lot of Aerial Acoustics out there. I'll never sell mine.