You can get smoked salmon at IKEA. They also every once-and-a-while have smörgåsbord/buffet events where they serve traditional Swedish food.
I went to the Midsommar Smörgåsbord last weekend and they had pickled herring, gravlax, and a few other fish dishes. Unfortunately, they don't serve a lot of those items during most of the year. I have a pic of all the fish they served at the Midsommar if you are interested: http://www.flickr.com/photos/superdeathsquid/7377923268/in/set-72157630140285106
I also just recently heard about the SwedeDish food truck (http://www.swededishfoodtruck.com/), but I haven't been able to try it yet.