Kobo(dot com) has eReaders that work great and so far they haven't gotten weird about what you can do with any old readers. My oldest one is going on 9 years old and has been passed down to my kid, who uses it daily.
Additionally, you can still break the DRM of Kobo books easily in Calibre. You don't need Amazon for literally anything book-related at this point. Every eBook I own (around 4k at this point?) is FREE. They are mine. It's still possible to do this. (If an author only sells on Amazon, well, that's a choice they made.)
Audiobooks? There's libro.fm, which lets you download unlocked files. All your current "locked" Audible books? You can easily break the locks on all of those too. My audiobooks are all free.