Same with electronics, just stay away from VCRs because scammers buy them and swap out parts then sell on Amazon. I always sell those on FB marketplace. I haven't done any flipping in awhile and have a pretty big death pile at this point. I'm sitting on a few hundred new old stock vacuum tubes that I need to go through and probably do a bulk sale as most of them aren't worth very much. Other than that my most recent sale was a AGP Nvidia quattro card from my personal collection that I sold for nearly $200. Iirc I paid about $30 for it a few years ago before people were really aware of them for vintage builds.