Saltynick, many of the older titles in Google books have fallen into the public domain.
If you go to The Internet Archive
http://www.archive.org/details/texts
and locate a book that you like, then you can download it easily. The EPub is automatically generated and may have a lot of OCR errors, but is usually readable.
Now, if the book won't download whn you click the EPub option, just click on "all files HTTP" and choose the EPub option.
Also check out Project Gutenberg for a lot of free books. And there's our own upload section (click on Ebooks on the blue bar toward the top of this page. You'll want either EPub or LRF format.)