You might even send coupons to the state Democratic, Republican, and Libertarian parties in your area. Here's a hot tip that relates to political campaign buttons. In the back of our minds I think most of us have fantasized at one time or another about being President of the United States and what I have done many times, as a way of saying thanks to a client, is to create a button that looks exactly like what a political campaign button and put their name on it. I will then send the button along with their order. It's a nice, inexpensive little novelty that anyone, especially an up and coming politician, would get a kick out of.
Hospitals are another group that often uses buttons.
Getting your foot in the door can be a challenge here, but to do so you might try using the FREE button coupon technique, or make some buttons to hand out to the nurses, again with your information sticker on the back. One of the most popular buttons that I have done is one that announces the birth of a new baby. Instead of, or in addition to passing out cigars, the new parents can pass out these buttons announcing the birth of their child. Then I put three asterisks, with several spaces between each one, on the next line. Then I put the baby's date of birth and finally the baby's birth weight.