You can save some money by using a toll free directory assistance service from any home phone or cell phone, as long as you are willing to listen to a few ads. You don't have to respond to the ads, of course -- the site will eventually give you the information you need free of charge and without obligation.
Dial 1-800-free-411 (1-800-373-3411) for toll free directory assistance.
Listen to a short ad followed by prompts.
Choose from business, government, residential. Ignore the "horoscopes" prompt.
Choose businesses or people by name or by type. Give a location as well. Don't expect the numbers to be up-to-date -- if you need the number for someone who recently moved, you will need to try a different resource.