Spend Less on Books
Books can be really expensive, especially textbooks. However, there're a number of ways to keep book costs down.

The first place to head is your public library, where the books are free. If they don't have what you want, they can get it via their Interlibrary Loan (ILL) program, which usually has a small fee.

Another free option is to borrow books from people you know. These can be friends, family, and even co-workers.

Often you can find books at yard, garage, and/or estate sales for bargain prices. If you go late on the last sale day, the seller will sometimes almost give them away.

Check out my list of free eBook sites on the Internet. You can often download them to read offline. Some sites also offer audio books.

Try thrift stores. Also look into sales/discounts at bookstores or the book section of stores. Some cities have temporary bookstores with remainders (leftover books that didn't sell) where books are offered for very low prices.

Campus libraries sometimes have a limited supply of textbooks to lend out. Some schools even have textbook rental programs with a flat fee for the term.

You can also buy books online. I've saved lots of money buying used books, especially textbooks, from sites such as eBay,  Half.com, and Amazon.com.