For those who wants to travel for less, check out BoltBus, but here’s the catch:
… [N]ot everybody gets that $1 fare. BoltBus offers at least one seat on each bus for that rockbottom price. Then as seats start to fill up, the price goes up.
If you are, say, the fourth person to book a seat, it might cost $7. Wait a little longer, maybe $10 or $15. The top price is $20 if booked online, $25 if you buy your ticket last-minute from the driver. (There is also a 50-cent surcharge for booking online.)