As wallets tighten heading into the holiday season, many of us are looking to take advantage of travel deals. Here’s the latest one to help you justify buying that $4 latté: Beginning today, Megabus.com is offering free tickets for service between January 14th and March 18th, 2009. Simply enter the promo code “greenbus” when planning your trip online.

The Megabus line stops in New York, Toronto, Washington D.C., Boston, Baltimore and Philadelphia, as well as 23 other US cities—Niagara Falls anyone? As if you needed another excuse to book tickets, according to Megabus, traveling by bus is six times more fuel-efficient than a single-passenger car per mile, making it a mega green transportation option and the best alternative to buying that full-price plane, train or bus ticket.

 

(Megabus, 877.462.6342, megabus.com)