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
Original Blue Note jazz LPs now sell for hundreds! I can't afford those - and wouldn't pay those prices anyway! Anybody want to bid on my Andy Warhol banana sticker (intact) Velvet Underground LP. Record mint - looks never played. Cover (version 3) is EX (showing signs of minor aging). There are some now on Discogs listed at over $1K not as nice as mine!
Speaking of tonearms: I have a NIB Mayware Formula 4. Back in the Days of Yore (1977) I had the Australian JH copy  mounted on the Ariston RDII Superior TT with a Microacoustic 2002 electret cartridge. This was a particularly nice sounding set up! 
When writing my post for this thread, I probably should have been clear to indicate the purpose of my question was with a view to sell the NOS items I originally obtained for a second vinyl system project, but have now changed my mind.  At the same time, I didn't want to appear to "sneak in" items for sale via the question, so I just asked the general question regarding the current market for items such as I've mentioned.  Sorry if I've wasted anyone's time by the lack of clarity.   Yet, the feedback and responses thus far have been helpful, nonetheless.
Dear @nolojunko : Always exist some interest in NOS audio items ( vintage ) but you don't need to ask/thread for that you just need to put an advertize here in Agon site and you will have first hand experiences about.

Agon gives you the opportunity to put on sale even through an auction or other alternatives to your items been sold.

Here in Agon are several audiophiles that can be interested about including me, just disclose it through an Agon advetize.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.