Official is 700 making it around 200 more. As I have said its simply how a free market works. Demand is high, Supply is low therefore a premium is paid by those who cant wait.
Regarding iShopping, had a quick look nowhere does it state guaranteed stock and the amount of 1/5 ratings for the site is indicative of what kind of service you will get, let alone the question of customs/taxes.
Back on point I already have offers of ?800 here in London so as I have stated before please refrain from commenting regarding price etc as its an advert not an opinion poll.