There's good news and bad news. The good news is that if you take the Chinatown bus ($10 each way) to Boston, you can get on a flight to London for under $300 ($263 + tax, to be precise). I assume you have friends there, and if not, I have friends there.
The bad news is that tickets to part II of the play are completely sold out, and tickets to part I are only available on 3 days in March.
The good news is that as there is no performance marked "last" on the website, they might be extending the run. =)