Probably not for everyone, but Facebook marketplace with local pickup is really good for some parts. YMMV
I was planning on buying an RX 6700XT from Newegg for $450ish, but instead managed to get a 6600 (non XT) for $80. I then found a 6700XT a month later for $300, bought it, and gave the 6600 to my cousin’s kid.
I also bought a shitbox I turned into a Plex server for $75.