I just went to a travelling agency here in Iceland called Terra Nova, the price here is somewere around $400 for the flight, $80 each for the show for 6 days, and $16 a day for camping at the eaa camping side.
For bookings and more information, contact Terra Nova-Sól, Iceland, Tel. 00354-591-9000, or via fax - 00354-591-9001.
For the english version of this offer see this link: ( I am sorry I´m not very computerliterate so you just have to copy/paste)
and here: http://www.airventure.org/2002/news/arngrimur_johannson.html