I am sure that you post on various forums from time to time. If you do not do it yet, I am sure that you visit some forums on a regular basis. Forums can be a free way to advertise your business without spending a dime on it. One way to advertise your business is to become a member on a forum and have a professionally looking signature. Every time you post on the forum, your signature is going to be fully displayed. You can include the link to your business in your signature. You might want to read the forum rules before making your signature though. You do not want to violate the rules and risk getting banned for doing something you are not supposed to do.