Pi still makes the Pi Zero for like $15 that runs linux, if you want a cheap low power general computer running linux
At least where I live, the Pi Zero is pretty much impossible to get, and when it's available, it's more like 60$.
You can run any OS on any Pi board other than the pico
By the way, I got a zero 2W a few months ago and it costed me 47€
At least where I live, the Pi Zero is pretty much impossible to get, and when it's available, it's more like 60$.