If either of you are drinkers, bring your duty free liquor. I would guess Norway is as $ as Sweden ($15 pint for generic vodka) Unsure about beer/wine prices in Norge but either one in a Stockholm bar is $10.
Sounds like could be a really novel trip!! Have you looked at tripadvisor.com? You can get fast answers--might already be a thread posted with what you need. Have fun and let us know how it was!