usually $5-10 in bars (don't know about Norway tho).
Actually a little higher, usually $8-$11. In a restaurant, club or upscale pub you can add $3-4 to that, outside of the cities it's more expensive as well. In a store the cheapest brands are about $4 for a half litre can. Alcohol and tobacco is (are?) very expensive in Norway due to "sin taxes". Re: sig, is/are? Both sound "wrong" to me, I think I'd go for "is".