Another great source of Linux friendly hardware: old Mac laptops. A few months ago, Apple stopped supporting old gear for the new iCloud encryption, and if you had any registered laptops without this option turned on, then you couldn’t use it for any of your gear.
The point is, that I put Ubuntu on an old MacBook and a really old MacBook Air (the very small form factor). These old laptops have a new life, and run great. It was incredibly easy to do the installs, especially compared to my first Slackware install that I had to do with a 2400 baud modem Internet connection.