Amazon. Public domain books from Feedbooks through their Kindle guide document.
I don't care about DRM (don't like it, but I don't re-read nor loan things so it doesn't affect me at the end of the day), who the publisher is etc. I just generally won't pay more than $10 for an e-book, nor more than the cost of the paper back on Amazon if it's a title available in paperback.
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