As a kid I used to frequent the Goodwill Electronics Waste store in Santa Ana, you could kit entire machines together for just a few twenties; the value of the parts compared to their once retail price was maybe 5 or 10 % of the MSRP even back then.
I went back two years ago to satisfy my nostalgia and found the place now filled with 3-4 year old product that hovered around the cost to buy the same parts on an online vendor of some sort, and any of the interestingly-old-but-useless equipment like old ISA video cards/early PCI stuff/AT keyboards/anything beige was marked up so huge by some staffer that mistook vintage for value that it was absolutely impossible to find anything worth buying.
Water damaged gameboy faded-grey cartridge? 200 dollars.
Pentium 3 e-Machine? 300 dollars.
480 line composite security camera with no power supply and no hope that it will ever do anything useful ever again in the future?
Does it have a beige or metal casing? 200 dollars.
I think I ended up finding some cheap molex-style 12v fan to buy for a few bucks (more than any online retailer, still), but it was mostly just a guilt purchase to help support the Goodwill.
I left incredibly disappointed.