One strategy to attain immediate business is to doorknock around active listings. This is a tried and true method since sellers seem to cluster. As anybody who has tried this technique knows, most people are not home when you knock on there doors.
So one way to make this method more effective is to leave a handwritten note saying, “I have buyers who are interested in purchasing a home in this neighborhood, but your neighbors home down the street was just not a good fit for them. Would you consider selling your house to them?” This is kind of a variation on the “I have Buyers” letters.