[goosedragons]

Kobo, Google Play Books, smaller niche sites like Baen, Humble Bundle, J-novel club, etc.

[stavros]

They let you download books with no DRM (or with DRM that works with any reader)?

[barnabee]

In the worst case, you can always buy it from Amazon and download it from Annas Archive

Or buy the physical book, download from AA, and give the book to charity when you’re done.

[stavros]

I don't want to give Amazon money for its anticonsumer practices, though, so I'll need to find something else.

[goosedragons]

Some have no DRM, like Baen, most Humble Bundles and J-novel club. Most books on Kobo/Google Play have DRM but it's really really easy to remove.