What used speakers raraely come up for sale

Philharmonic Audio 3 great sounding speakers at a reasonable price.

Ridge Street Audio - Sasson - An incredibly good stand-mount speaker that was probably under-priced new @ $10K when it was on the market. I don't know how many Robert sold, but you never see them for sale anymore. I heard them in 3 different settings and all were fantastic.

spendor sp100r ,spendor sp100r2

Any of the Apogee models.

@cakids,
Agreed on the AP Scorpios.  I owned a pair in ebony for a while and the were one of the most attractive speakers I've seen.  Plus they sounded great.  A real bargain for high end sound and aesthetics if you can find them used.