Do you have a business card? if you dont you should make one. I always carry mine around in my wallet, and just gave one to a prospective client yesterday. You could look on the internet for local businesses in your area and see if they have a website. If they don't have a website, or have a website that is bad / out of date you could drop by and ask to see the manager.. explain who you are and what you can do. Also explain how important a website can be for marketing reasons. Give them your business card and tell them to call if they're interested.
You could also make and print some flyers if you wanted and post them on bulletin boards around your local area. Oh, plus SEO for your website.