I'm moderately happy with my Pinebook Pro.
But I used to buy off-lease Dells. Search in the right area of EBay for "no hard drive". Some people/companies who lease pull the hard drives for security reasons and you don't want a used hard drive anyway because they always crap out. So buy a nice big new HD or SSD and put it in. If you're going for really cheap you may have to change some other parts too but just grab the service manual PDFs from Dell. I paid $35 for my current Dell this way, and this is the 4th one I've bought this way. I have an HP that sold for $1 but I'd avoid them.