All around the world you can purchase a bus ticket in any town or city. Paupers love the bus because it's really cheap transportation. In America Greyhound is huge, offering 2,600 destinations in 48 states, Canada and Mexico, with 1,800 daily departures. Lots of discount opportunities too. Call 800-229-9424 and visit them by clicking here.
Busabout is a "hop On-Hop Off" bus company in Europe. You can join their discount members club for added savings on hotels and meals. Visit them by clicking here.