My newest addiction is thriftbooks.com for cheap, used books. Free shipping if you spend $15. My library has grown without depleting my bank account. It’s fantastic. They have a ton of books available in all conditions. Sure, sometimes I have to annotate the front of my used books that my markings do not include lols or smiley face, (I’m all stars and exclamation points, baby) but for the most part my books are in great condition. If you use the link above you’ll get 15% off your first order. Plus, every $50 you spend you get $5 towards your next order. Happy thrifting!