hmm... i know youre not talking about Greyhound. There's a private owned travel company called Dragon Coach that offers fairly cheap bus transportation btwn Chinatown, DC and Chinatown, NYC daily. The only hitch is that you have to order tickets a few days in advance or online and the "special" rate only applies to certain departure times. otherwise they are pretty reliable. 4 to 5 hrs non stop each way.