The free trips can be booked to or from more than 70 U.S. cities and Toronto. Travelers must use the promo code GOFREE. Since the offer is limited and subject to availability, you're more likely to snag a freebie if you're flexible and can travel midweek, particularly on such popular routes as Washington, D.C.- New York City.
Megabus.com, which launched in 2006, is among a growing number of intercity bus services offering cheap (as low as $1 each way) fares with such frills as free Wi-Fi and power outlets. In its just-released list of Top 10 best value destinations for 2012, Lonely Planet lists the Northeastern U.S. because low-cost bus companies make it possible to "hop-scotch across the region without booking a flight or hiring a car."