2. Saves you money - Each time you use your card you are saving money. There is a huge savings benefit to borrowing instead of buying. If you consider the fact that most books cost between $10-$28, some quick mental math reveals you can easily save hundreds of dollars a year. Couple that with access to all sorts of other media and online tools, and families could easily access hundreds, if not thousands, of dollars worth of value for free. Try the Library Use Calculator to see how much you save each time you use the library.