In 2005, I got these for FREE from someone looking to offload his vintage stuff:
-Mac 512k (had water damage and a horrible mold stench, I didn't keep it)
-Mac SE/30 (kept)
-Mac iifx (kept it for years but it completely ceased functioning, I brought it to an eco-center - I didn't have any repairing chops and nor youtube, nor BRANCHUS CREATIONS
@Branchus was around to teach this stuff quickly)
-Mac LCIII (kept, but has a battery explosion that I've since cleaned up, gotta figure out the rest without a monitor)
-12 inch apple monitor (kept, but has ceased working in the last years)
-13 or 14 inch apple monitor (kept, but has ceased working in the last years)
I also saw a SE/30 laying around in the recycling bin of a Bureau en Gros/Staples store (must have been 2008 or 2009) and I was moved to consider asking for it, but I was out with my girlfriend and we were calculating our space for our plans to move in together and it wasn't a good time to increase my collection. With hindsight and/or time travel, I would so much have liked to nab it. It's very possible that even back then, they could have refused me due to data privacy concerns, but it was definitely less draconian than today's.
If I didn't have any of these machines, it would absolutely suck to go hunt for them. I think current me would bite the bullet for just for SE/30 and even then, I'm not sure. Ebay and facebook marketplace are generally bad places - local vintage user groups are infinitely better to find great stuff. You can stumble upon several massive hoarders in these groups and they are more than willing to hook you up with a nice machine if your needs are specific enough. That's how I got myself a not-top-of-the-line-but-still-good 486 DX/66 IBM PC 2 years ago with an ok CRT. The cost wasn't low but it was more than fair and getting it local without shipping anxiety and cost and the human connection you get with knowledgeable same-minded folk is an intangible HIGH value.