Washington Deluxe offers trips between Washington, DC, and New York for $35 roundtrip or $20 one-way. It's definitely a bargain and in some ways more convenient than the (in)famous "Chinatown buses" in that this bus service has dropoff points in places other than Chinatown. The ride is also very comfortable with few stopping points. The key factor is making sure that you get there early enough to actually make it ON the bus...
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