Concert Poster Gallery holds an auction every month or so. I have purchased a couple of items from them, very straightforward group to deal with. I have no affiliation other than that, but thought this might be of interest.
On the PAE auction right now, there’s a CGC-certified 9.8 poster which includes a swipe of a Graham Ingels cover. Can’t remember what the issue is, might be Startling?
I have a few posters from the psychedelic era. This one is not mine, but I think it’s a great image.
I saw the band Nashville Puśsy about 10 yrs ago - pretty good show, a literal fire-breathing female bassist on a small venue. And of course, Lemmy on the same marquee must have been a heck of a show.