For a great deal on first-class bus transportation between New York City and Washington DC, check out Tripper Bus.
The catch is, you have to plan ahead to get one of their steeply discounted promotional fares of just $1, $5 or $10. But the good news is, there is one seat available at each price on every trip. To get the low fares, all you need to do is book early; as the cheapest fares are available to the first, second and third passengers.
Like other commuter services, Tripper Bus does not maintain a terminal; but instead uses public stops, located near metro and city bus connections. Pick-up and drop off locations in Washington DC are near the Rosslyn and Bethesda Metro stops; while the one in New York is near Penn Station.
Lift-equipped buses are available with 48 hours advance notice. As an added bonus, all buses are equipped with wireless internet connections and electrical outlets.
So plan ahead and travel from New York City to Washington DC for just $1. How cool is that?