If you use their credit card, British Airways offers 2 for 1. I split the cost of 1 ticket with a buddy. Saved me a good amount.
And the "how" on how I afforded it: I worked for a year, saved every penny, quit my job in May, traveled for 8 weeks, and then started grad school. Loved it.
[This message has been edited by careerchange05 (edited 2/14/2012 1:27p).]