How to obtain e-books in Norwegian
We occasionally see threads discussing the difficulty of obtaining literature in Norwegian here on the forum. As a relatively minor language, the availablity of Norwegian language literature to learners abroad is sadly limited or non-existant.
E-books allow you to download titles to your pad (Android or iOS), without having to worry about shipping from Norway. A list of Norwegian e-book stores can be found here. Ark and Norli are among the biggest chains of physical book stores. Along with Adlibris and Tanum, they might be good places to start. The Narvesen e-kiosk seems to be discontinued.
E-books from any Norwegian provider in the list is stored in the unified digital bookshelf "Bokskya". You can choose to read e-books in the related reader "Bokleser" or use each store's own app, which also often provide in-app book purchase. You can read more about Bokskya and Bokleser via the links on the left in the link above.
Most Norwegian libraries provide the opportunity to borrow e-books via the app eBokBib (Android/iOS). This service requires a Norwegian library card, which can be obtained by going to a Norwegian library in person with a valid ID. As such, it is not an alternative for most learners residing abroad, but it provides a large selection of books for free to those who are able to use it.
I'd also like to add, if you have a Kindle you can download some books in Norwegian from Amazon. I know for a fact they have the entire Harry Potter series, because I saw the Norwegian translations when looking for the French ones.