I wanted to post this before all supplies dry up. Mega Bus is offering 200,000 free tickets on routes scheduled between Jan. 4, 2012 and March 1, 2012.
To see if a route you want is available, type in the promotional code GOFREE at their booking site. There are a select number of tickets for each available route. Good luck!
Perhaps you'll be able to get to Occupy Congress on January 17, 2012, for free:
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