I just bought a pair of PS Audio M1200 and considering a PS Audio BHK preamp that's 5 years old and offered for $3400 with a couple of spare tube. There are two others around the same price on US Audiomart but ages aren't given.
Thank you
Current retail on the BHK preamp is $6,600. If you have gear to trade in you can get credit for the full retail price of the trade in gear up to 30% of that or $1,980 bringing the price for a new unit down to $4,620.
I bought my BHK pre used for $3,000 when retail was $6,000 or 50%. Given that, $3,400 is about right. The seller might take a little less.
So $3,400 for used and out of warranty vs $4,600 plus a trade for new.
My BHK preamp is also feeding M1200s and they make a killer combo.