If you are looking for a book in a nearby library, WorldCat can tell you. And it’s FREE!

Just go to WorldCat.org and search for a book by author or title and WorldCat will tell you what libraries have the book, showing you the libraries that are closest to you (and how far they are).

You can also contact your local library and ask for something via InterLibrary Loan. Every library can borrow from other libraries, so your local library can get things on your behalf, even they don’t own a copy themselves.