Not all libraries have this perk, but mine does. I can use their computer and print 50 cents worth every day. Black and white is 10 cents per page and color is 25 cents. When I need to make a copy of something, I take a picture with my cell phone and email it to myself. I then print it out from their computer. If I used their copy machine, it would be 25 cents per page.
I save on paper and ink at home. Little things add up!