Google Results Now Include Your Local (USA) Library's Ebooks
Google just made free legal ebooks much easier to find. Search for a book, and in the info bar on the right, under the buying options, Google lists local public libraries that have the ebook. (On mobile, tap the “Get Book” tab.) If you’re a library member, you can borrow it right away, right on your device.
And depending on your library’s collection, you might be able to load it on your Kindle or in iBooks, or you might need to use a proprietary app. These apps vary wildly in quality; Libby is sometimes even better than the Kindle app, while NYC’s SimplyE is awkward and buggy.