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.
What's wrong with them? The M1 was popular and now people selling them are competing against a lot of other people selling them which suppresses the price. Like it or not, Macs are mainstream and therefore aren't going hold a "magic" high price.
13th Gen Intel, 14” screen, 16GB/512GB at about $350.
Lenovo and Dell both make similar business laptop models at around the same age and price point.
Businesses sell off perfectly functional laptops in bulk because they are on regular refresh cycles for employees, not because there’s anything wrong with them.
On the Mac side, MacBook Air M1.