Big Dipper was one of my favourite record stores when I was visiting Oslo. The selection is quite ample, across a number of well organized genre'd sections.
Up in the front, they had used arrivals, with both good finds and reasonable prices. Elsewhere, I spotted some harder to find items (Europe-only releases, etc.)
In a few areas of the store, they also have a lot of hi-fi related equipment. While not something I could take advantage of (no way I'm taking back a pricey turntable on the long flight home), it was fun eye-candy. It seemed like the staff was very knowledgeable and willing to help the customers who were interested in those bigger purchases.
Definitely recommend for vinyl collectors coming into town! read more