Norway being Norway (and thus, expensive), it's generally cheaper to order online from abroad, but this way, if you're in Trondheim, you don't have to wait for shipping, customs etc, and you can also avoid using your credit card online, if you don't want to. The last goes for their online stores as well, which accept both prepayments and cash on delivery.
Their webpages are here: Krusedull & Kenguruloftet (both in Norwegian, obviously).
The Middle of Nowhere now has a cup vendor! ;)
ETA: Really, if cups are sold in Norway, it's a big step. We might be quite liberal in this country, but we're slow to catch on. I blame the cold :p