From almost anywhere in the US it's just over $300 (including taxes and fees; base fare is $200) to get to the UK when Sixteen Tones is going on -- but only till midnight.
The only way I'm going to be able to do this is if I can mysteriously make $300 appear in my accounts by then. (Heh.) I'm "figmo@paypal.com" if you feel charitable, but I don't expect it in this economy (sigh).