People that stacked OverDrive Libraries
Awesome way to get e-books - similar to a library where you can borrow for 3 weeks for free. They also have "skip the line" loans where you can read a book for 7 days. The Libby interface is also great!
Borrowing Kindle books from the LA Public Library has been an absolute game changer for me, as I have a costly book buying habit. I still buy books when I know I'll want to keep them around, but it's amazing to be able to get things on a whim for free. Long live the library!