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As mentioned by Randy Charach he do advocate lead generation advertising in conjunction with personal contact if you have the time and inclination to do both. He used to do a lot of faxing, and it was very effective, so he recommend it as a low cost, proven method of obtaining leads.  Post cards, letters, email and ads in publications that your potential customers read are also methods of marketing to be considered and utilized. Remember, the purpose of this initial contact is to elicit a response from those who are interested in receiving further information.  Check the resource section for publications that go further in depth on the subject of lead generation advertising.