Do you remember the good old days of heading over to your local library and picking out an armful of books to take home for awhile? How about those days of finding a soft cushion in the corner of the fiction section and curling up for awhile? Those places still exist, and you can still use them in the digital age as well.
Your local library has made some modern adjustments to enter into the digital world. Many libraries have apps where you can download a book, and it disappears from your hard drive once the book is due back. Check on your library's website, they may have their own app or they may use one like Kindle to support it.
Freegal is a relatively unknown app. Your library makes a deal with Freegal, and by using your library card number you can download music every week. Not all libraries have a contract with Freegal, so make sure to check before you download.
Many libraries also have annual or bi-annual used book sales. Community members donate books they no longer want to the library and it is then sold for profit to benefit community programming and basic costs.
Ever considered a Book Club? Sometimes your library will assist in finding the books and hosting a location to have your discussions. You can also have the club posted online so new members can find you.
Finally, try paperbackswap.com. Post books you own but no longer want and receive credits for mailing them to other users. Credits can then be traded for books you are interested in reading.