At least in my part of the US (midwest), estate sales are the best place to find old tools. People hold onto them until they die, but then you can buy them! estatesales.net (no affiliation, just a user) lists the vast majority of them, and usually even has pictures of what is for sale that you can scroll through before actually going. I've gotten a lot of insane deals on tools this way -- just recently bought a vintage (good quality, perfect working order) 10inch wood bandsaw for $20!.