Dude, how are you posting this thread now? And how is it that I'm able to help you, I'm a newb!? I just went through this a month ago after my fancy tablet died after a year.
Thinkpads, man. Thinkpads.
Look for ebay postings. 400-500 series. '4' or '5' designates screen size. Go for the 200 series if you don't mind a smaller screen. The tens digit is the generation, ie a t450 and a t550 came out roughly at the same time, and the t550 has a bigger screen. Once you've found the model with the features you want (for example, my wife wanted a CD drive, so I used google to see that the e570 had one), check ebay and dig thorough the posts to find a complete one. Or and incomplete one, if you're capable and willing.
All of them are big, solid, easily accessible screws, easy to work on. The keyboards, screens, ports, ram, and drives are all standard and replaceable. Just check out some youtube videos. Key point being the batteries: most of them just clip in and out, with replacements widely available. That's a gamechanger, when compared to the super thin models of today with glued-in batteries that can't be replaced.
Google search specifying reddit posts for specifically which models have stood the test of time. When you do your ebay search, you'll see that many resellers go ahead and update hardware for you. So you'll find 6-8gb ram, running windows 10 or 11 already, some have upgraded to an SSD for faster run times. You'll probably want to avoid i3 chips, and try to get the ones that already have i5 or i7.
I got a t450s for $85 shipped, i7, 8gb ram, 256gb ssd, pre-installed Win11. Battery still lasts 3-4 hours watching a movie. I got my wife a e570, i5, 8gb ram, 500gb ssd, pre-installed Win11, for $82 shipped; it has a chip out of the plastic on the back cover, cosmetic, no big deal, cover it with a piece of tape.
And the best part that I'm currently in the process of discovering? Ditch windows, run Linux Mint or Ubuntu. They only need 25gb on the drive and 2-4gb ram, and it's so buttery smooth on this 10-year old laptop that I'm typing to you on. I've always wanted to dive into linux, and I'm mad that I've put up with windows for as long as I have.