We are in a bubble, and the shortage of chips just adds to the price tag of used equipment whether or not it is something enduring. It doesn't interfere with my listening for now, given the equipment I use. I had to replace an A/V pre-pro recently for the small A/V system here (nothing to do with the music systems) and that wasn't easy since a lot of appliance type CE is backordered.
We are doing a kitchen renovation and I was shocked that the dishwasher we ordered actually arrived. I trust that will improve with time. As to Saul Marantz/Sid Smith stuff, it's been high priced for a while. The OP doesn't sound confused about what is enduring and what isn't.
There was a shop here in Austin, now closed, that specialized in '70s receivers and big bookshelf type speakers. Kind of a time warp. They didn't really have anything I would buy (except for some serious antique poster art), but I visited a couple times. The one guy's name was.... wait for it...
Robert Johnson.
They also had a coffee bar. Because this is Austin. :)