This quick tip won't work for everyone, but it could work for some.
Instead of sending some of those monthly bills in, walk them in. Our utilities company and phone company are both within walking distance of my home. During the spring, summer and fall I try to walk to these companies to drop off our payment instead of using a stamp.
This isn't huge savings by any means, but it does get me outside. Fresh air, exercise, and saving a couple of stamps. I can handle that. :)