how would you know which places to patrol, and when?

This is an extremely regional problem to solve. Where I am, which is a village and exurban-ruural, you would go to the electronics recycling depot and see if they have any choice items. Also you could call the various independent pc repair people to see if they have anything no longer supported but functional for free or cheap.

Also there’s various thrift stores that sometimes have computers cheap.

The closest big city is Vancouver so to curb cruise there I would pick upper middle class neighbourhoods with alleyways, and drive around on garbage collection days. I wouldn’t really dumpster dive unless I knew of a likely source from hearsay.

I have a bunch of old macs here with different distros onthem, mostly Mint, that I have been trying to give away to locals (without being obligated to provide support, which is the stickler apparently). They all run great. One could dumpster dive or curb cruise, or around here, lurk at Recycling.

Not me, I am a damn dirty ape.

Wait didn’t MEC collapse into / get bought by a regular corporation?