Aeon is an old model, but it was Giro's top of the line for a while and it's crazy light. You can probably find one on sale somewhere in the US if you try hard enough, not sure about Norway.

I like the new Giro Synthe MIPS helmet, but $275... good grief. They seem to be unloading the slightly older, non-MIPS version now for close to $100 if you can find them.