Last year, Selfridges was selling one for 85GBP (OK, it was a sandwich...)

http://blogs.guardian.co.uk/news/arc...t_an_earl.html

There's a link to what it calls the most expensive burger in the world - which is the one mentioned by Taiwaned, but I'm not so sure that's correct anymore

How about this one:
http://philipgolingai.blogspot.com/2...weight-in.html
at $210!!!!
(The blog seems to contain factual errors about the ingredients, I don't think there is any beef called Matsutaka - there are Matsutake mushrooms which are highly prized and expensive - sort of similar to porcini/ceps.) EDIT - He may have meant Matsuzaka beef.