Mr Fox I have used www.quantummail.com. They have a feature to select properties adjoining an address. They might have a minimum of 20 pieces, but you put in the address and it will return a list of adjoining properties up to the quantity you specify. I am not sure if they sell the mailing lists. What I used them for was to print and mail an aeration post card. This might be worth a try for you. The cost of the printing and mailing of the post card was about .50 each. If you have questions, they are very helpful on the phone. The phone # is on their web site.