What used speakers raraely come up for sale


Lets keep it under $7,000 used, but interested to hear what used speakers rarely get listed for sale because they are so sought after and if they do appear they get snapped up very quickly?  Cheers
spoutmouzert
Thanks for all the replies, its interesting researching all the speakers listed.  I was impressed with Sonner Audio monitors at the NY audio show a few years back, never seen any used for sale mind.  
@beetlemania,

By golly, it looks like your ship might have just come in. Saw some Ascents listed here within the last couple days. Around $4K if I recall.
Martin Logan  SL3,JBL 4311Spica 50B&W 805
Candlewood speakers out of  production