I have mixed feelings on this.Should old stuff be cheaper because it's old, or should it be expensive because you can't get it anymore? I've seen many things turn into "vintage classic collectible" after being "cheap, outdated, old junk" for years. Old body style trucks, CRT Monitors, typewriters, Mosin-Nagant rifles.
Ultimately stuff is worth what people are willing to pay.
The proliferation of selling things online has probably driven up prices more than anything because it connects motivated buyers with sellers with low friction, and allows even a fairly unmotivated seller to do accurate market research.
If you want a good deal on something old, your best bet is thrift shops, garage sales, and FB marketplace.