BookBub is my #1 favorite way, outside of my local library to get my hands on discounted eBooks. I have come across so many new authors. It's as easy as creating a free account and then choosing the genres you want to get a daily newsletter about.
NetGalley is an innovative and easy-to-use online service and connection point for book publishers, reviewers, media, librarians, booksellers, bloggers and educators. NetGalley delivers digital galleys, often called advance reading copies, or ARCs, to professional readers and helps promote new and upcoming titles. Professional readers--reviewers, media, journalists, bloggers, librarians, booksellers and educators--can join and use NetGalley at no cost.
Project Gutenberg is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired. Thousands of volunteers digitized and diligently proofread the eBooks, for enjoyment and education.
If you want access to a large library of ebooks and eaudiobooks, check out your local public library's digital library. Most libraries use a platform like Overdrive to host the collection. All you need is a library card to access your library's collection and some device to access the titles, such as a smartphone, tablet, or computer. If you have an eReader such as a Kindle paperwhite, you will need another device to help you get the books downloaded to your device.