There's no denying it: College is becoming increasingly more expensive. That's why we love the idea of renting textbooks—it's an easy way to save each semester. While there are a ton of book rental sites, we especially like Book Renter for its library of over 5 million books (plus free shipping!), and Chegg, which puts a priority on low prices. In some cases, you may even be allowed to highlight or take notes in book margins.