Norway is by afar the most expensive country on that rute though, mostly depends on how youre planning to live. If it's hotels \ motels and eat at cafe's and restourants then it's gonna be hell'a expensive. But if youre mostly gonna be living in a tent then it's probably gonna be allright.

If I was gonna cycle thru Northern Europe i'd rather cycle around the Baltic Sea then do the North Sea Rute though. I think you'd get a far better climate then, and it'd be quite a bit cheaper aswell.