Use SPENDON GAVEKORT:

Visa giftcard that sells in Norway under the name "Spendon Gavekort."

These are sold by Narvesen and 7-Eleven Shops.
Narvesen and 7-Eleven shop's locations in Norway:
Narvesen Shops
7-Eleven Shops
Alternatively you can also buy them online here.

More information about the "Spendon Gavekort" can be found here.