I have gotten blåbär (bilberries: https://en.wikipedia.org/wiki/Vaccinium_myrtillus) at markets in Sweden. You can get frozen, picked-from-the-forest blåbär at e.g. Coop or Ica. There are also products in Sweden that list Vaccinium myrtillus rather than American blueberries as the ingredient, though they are not as noticeably better than blueberries when all sugared up and as just one of many ingredients.

There was an airline that serves or at least used to serve blåbär juice in-flight in or to/from Sweden. I don't remember if it was like SAS or BRA, but one of them did. Kind of an expensive way to get a taste.

Usually I just go to the forest myself. The wikipedia article says that they grow in quite a number of places around the world. In northern Sweden, they are everywhere, and you have the absolute right to harvest them for personal use, AFAIK.