I'm starting to see 2020 M1 MacBooks CA$350 on Facebook Marketplace. That's the device I'm using to type this out. It still lasts all day, and it's still the only computer I use.
The fact that it’s listed is meaningless. You need to ask the seller what’s wrong with it.
I use a 16gb ram 1tb ssd 200USD m1 macbook air. Works great!
My daily driver is a refurbished Lenovo Thinkpad T14 gen2 with R5/16/512 GB. 360e last year from a trusted retailer with a 1y warranty. I expect I'll be happy with it for some years, as my previous T450s is still running as a homelab.
I also just acquired a 2014 MacBook Air for two packs of coffee to use as a distraction free tty writerdeck and toy around with, as it's my first piece of Apple hardware.