Well, the neat thing about the web is that it doesn't have borders.

I tried www.google.co.uk, and searched on UK sites.

This was one of the first sites: http://www.tyresave.co.uk/alloykhn.html

2450 GBP for a set of four, VAT included.

$4623 US at current exchange rates.

Add shipping to that, and any importation costs.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue