Here's a pretty good list...
hit up small businesses
Definitely the place to start, go after those without a site or an awful one that has never been updated since they first got it.
Tip: Walk around your local industrial estate looking for Wifi access points that use weak WEP encryption that can be hacked in mere minutes or have none at all. This knowledge can be a useful for getting a prospective clients attention.
Public Houses or Bars depending upon what side of the pond you live are often overlooked yet fit all the criteria for a small local business. Never underestimate the reach of the small social networks associated with them.
Churches, Gyms, Clubs, Farm Shops etc..