Of all things used Im most skeptical about microphones "used"....the spittle, dropped, smoked, abused, corroded, etc... is the reason.
With brand new SM57 at $99 and SM7b at $399 with warranty and brand new....did I say brand new capsules?
For Used, I prefer Reverb these days.
Numerous well done transactions with them and the chat help has been great with all questions and issues.
Ive done all the online and local shops, and still surf them from time to time.
Microphones though...hmmm? Ive bought them used but it has to be a 60% or more cut, like a Shure KSM 44 for $375 or a KSM27 for $80.
I got my first tube mic, Rode NTV with Jensen, Wima..etc..for $275 with case, all papers and holders. I also got a AKG used cheap.
Imo, its just high risk on used mics. Didn't someone get burnt on a Neumann a few years ago that had a Chinese capsule in it?