_http://www.skydigitalcards.com/product_info+28.html&osCsid=mrnuvgtfib9qign28ten3gttr7
Sorry bert i forgot to get back to you. This link is 1 place, although i dont personally know them.
I know of a guy in spain too, website is britsat.tv but to be honest he is a bit expensive (i think 125 euros *per year*) so i'm sure you'll get better.
Check with whoever you buy with because i think most wont charge 'per year' they just charge on a 'per needs' basis- you have to go through them all the time. You can set up the sky direct debit to a uk credit card, which will be debited in euros.
Apart from that maybe someone else has an alternative? The other company that was popular was skycards.net but looks like they have been closed down.