There's endless free reading available online, much of it public domain, some of it with a creative commons license, some of it just made available by the rights holder.
Google Books and Project Gutenberg are two of the best sources; science fiction and fantasy readers will also be interested in Free SF Online.
The quality of scanned books vary a lot -- in many cases, you have a choice between a PDF of the raw scanned images of pages, or buggy text automatically generated by optical character recognition. If you'd like to help improve Gutenberg texts, you can be a distributed proofreader and fix problems yourself.
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