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If you can download them you can just email them from your own email account.
Otherwise it depends what you're looking for. Various publishers have their own ebook stores with various levels of DRM (Baen for instance has no DRM) or places like Project Gutenberg have free, out of copyright titles.
Obviously there's also torrents, newsgroups, etc. Generally a bit more faff but sometimes the only option.
OK so I’ve ive added the email address. What site do I get the books from? The regular site I use requires member ship to send books to email