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Gutenberg (US, Canada, Australia ... different sites, different books) are the first place I would check after MR. Amazon, Kobobooks, B&N are sources ... but sometimes there is a charge for what "ought" to be free. Archive.org has scans of millions of books, sometimes available as Kindle format but usually pdf -- at least they are available.
If it's something specific -- a title or author -- Google is your friend. There is an astonishing amount of material available for free download scanned and checked and posted by enthusiasts who happen to be passionate about that author.
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