Ok, it may not be a discount, but you pay 25 % less than the poor Norwegians.
Unless you're logged in, prices are shown with 25 % Norwegian VAT (except for books). Customers outside Norway doesn't have to pay this tax and if you live outside Norway you will pay 25 % less than shown in the store. To see the actual prices, create an account and fill out your address.
Note that all prices are shown in NOK (Norwegian Crowns). You can check the NOK against your preferred currency using this tool. Just input the price in the NOK field and it will automatically convert to other currencies.