A good place to start would be selling the U.S. Postal Service. In order to provide us an increasingly low-quality, poorly-managed, inefficient, and unneeded service, Americans pay billions every year to fuel and maintain the USPS fleet of over 250,000 vehicles, its huge staff (it's the third largest employer in the US), infrastructure, and operations costs.
Well a libertarian friend and former schoolmate of mine sent in this photo to illustrate my point:
Thanks for the photo, George!