What's the market these days for NOS 70's/80's cartridges and/or tonearms?


I've noticed the market has seemed to change with respect to a lot of vintage gear.  However, it used to be that certain vintage gear, especially if NOS, such as the Pickering, Shure, Stanton cart's and perhaps SME tonearms never went down.  I'm getting some indication that this may no longer be the case?   Yet, recent searches hasn't turned up any useful data.  Any ideas on market or sources to determine the market?
nolojunko
Even if you don't have any feedback history you can still make fair prices (especially for NOS items, for used items grading must be very accurate, it's better to under grade than over grade) and build your reputation. With paypal your buyers are fully protected with paypal buyers protection (they can return everything for full refund if they are not happy with condition).  
@chakster

Thank you for the kind and informative response guiding me through the various online seller/buyer options, plus the other advice relative to selling - very helpful!
And my post about high listing fee charged by audiogon for every listing, even after I paid that fee myself several times in the past (while other platforms never charge listing fee), was removed by audiogon moderator. Posting truth is prohibited here.