Offer to speak free of charge at a meeting. Offer to write an article on your type of business for your local newspaper free of charge. If someone is really interested in your product send them a media kit or extra business cards to give to friends. The person you speak with may not want to do business, but they may be best friends with someone who could become your biggest client. It pays to treat everyone nice.
Trade shows are the great equalizer.
Don't always focus on being a vendor. Pick some trade shows that you can go to and just network with as many vendors as possible. Teach a class. When you teach a class, you automatically are introduced to potential clients. Online networking is a new phenomenon that is changing the way we communicate.