Your high school guidance counselor will have books and CD-ROMs with listings of people giving away scholarship money. Some public libraries will also have a book with a listing of charitable foundations.
Beyond that, any college that is reasonably large or reasonably old will have thousands to millions of dollars in scholarship money to award: someone left money to his or her alma mater to fund the education of left-handed violinists with red hair who planned to major in English, and if you qualify, they’ll give you the money, because it’s one of the ways they maintain their tax-exempt nonprofit status.