You may want to consider something as simple as hiring a local high school student who is presentable looking to knock on doors of any house that looks like it could use some repairs. If the owner was not home make sure to leave a nice flier inside the screen door.

Door to door may sound old fashion but I can tell you Verizon outsources companies to go door to door asking homeowners if they would like to upgrade to Verizon Fios from their current cable hook up and they are very successful. Why not home repair? You could probably hire the student on commission......