Here are the details for getting Eupens:
http://www.audusa.com/main.htm
Click on "AUDUSA Eupen" on the left hand side. There are two types of Eupen cable the GNLM 05/2.5 which is £48 for a 1m terminated cable and the GNLM 05/04 which is £58 for a 1m terminated cable.
The GNLM 05/04 is fatter and it's white instead of black. Of the people who've tried both (including myself) most prefer the cheaper 05/2.5 cable.
You can't order it off the web directly but just give them a call: +44 20 8241 9826 and they're very helpful. Remember to ask for the correct type of mains plug to be fitted for Norway - I think it's Schuko like most of the rest of continental Europe.
As for the Shunyata (Sidewinder etc) cables, they are harder to get hold of as they are not sold in Europe. You have to buy from the US and that means you then have stick a European mains plug on aswell once you get it. They're also quite a bit more expensive.
Michael.