I got an Onyx Boox Leaf 2 e-reader, and it's fantastic, I'd highly recommend it. The great thing about it, is that it runs Android, which means you can get Hoopla, Libby, Overdrive, the Barnes and Noble app, the Kindle app, etc, so all your ebooks are in one place and can be read on your device.

https://onyxboox.com/boox_leaf2

I get all my ebooks for free, by getting public domain stuff from these two places. PG has more selection but Standard has better formatting and is just generally higher quality.

https://standardebooks.org/

https://www.gutenberg.org/

I rent ebooks from the library using both Hoopla, and Libby.