There aren't any, unless you go second hand. LOS and nearly all custom ROMs are aiming at widespread, mostly high end devices, which is one of the big problems.

I've learned this lesson.

If I have $200 to spend on a phone, I will not buy a low-end 2019 $200 phone.

I will buy a used (or new-old-stock) flagship that was $700 when it came out a few years ago, and is now $200 on the used market.

The older flagship will have similar specs to today's low-end junk, but also all the enthusiast support, better accessory availability, and probably better build quality overall, because it was originally intended to be the highest of the high-end.

Flagships have the most idiotic designs though, as far as I looked around. Low-end current year $200 phones often have removable batteries, headphone jack and dual sim support. Flagships typically have none of that.

I mean if you can go so far as to install or build third party ROMs, it'd be an interesting weekend hobby to repair electronics yourself.

I've saved hundreds of dollars of technology on trivial home repairs instead of buying replacements.

$300 but that got me a Samsung Galaxy Note 9. Headphone jack and all.

You'll also have to replace the battery though

So? I literally just ordered this last thursday. It cost me $4.15: https://www.ebay.com/itm/323865336446

Get a used Galaxy S5, should cost less than $100. Has an oled screen, so switching ui to dark mode saves battery. Has a headphone jack and removable battery. Runs Android 9 via LineageOS

Thanks. Is that the original lineageOS or one of those "what works: you tell me ;)" ROMs?

I'm surprised nobody mentioned xiaomi phones yet.