This idea came from a friend in the business.
If you have a vacant home for sale, determine the date and time of the trick or treating in the area. Get some (good) candy and a stack of business cards and camp out at that house for the 2 hours or so.
When the parents bring the littlest of the goblins to your door, hand out a business card or other promo device to the "chaperones".
Also, you may want to buy a few pumpkins and decorate the porch/front door area.
This method will put your face in front of ONLY neighborhood folks, SMILE :) !