You can find a lot of free epub ebooks on internet, here is some website I like to download free ebooks.

1 www.epubbooks.com Download free high quality EPUB eBooks for use on your iPad, Sony Reader, iPhone, Kobo, Nook, BeBook, Desktop Computer and other eBook Readers.

2 Google books Search and preview millions of books from libraries and publishers worldwide using Google Book Search. Discover a new favorite or unearth an old classic.