Amazon (UK) does have some Norwegian stuff for Kindle, but it is not a great selection. Not sure if they are planning to launch Amazon Norway any time soon (they recently launched in Sweden as a separate franchise).
With Swedish stuff I buy epub files from a site called Bokus and then send to Kindle. I guess you would need to find the Norwegian equivalent. I also have a (crap) Swedish dictionary installed, which means i can press any unfamiliar word and get the translation. This is really useful when it works, which is about 1 in 4 times.