Link: http://www.megabus.com/us/index.php

Thought the deal for $10 to go from Toronto to Montreal or vice versa was good... wait till you see the deal from Toronto to Buffalo, Buffalo or New York city...

Follow up:

Hard time believing it, but yes, just $1 each way. Sure it's a bit hard to find, but it's definitely out there. Just $1 to Buffalo airport, where you can grab a cheap SouthWest flight! Woohoo.