I don't know, they aren't even sold in Europe in markets AFAIK (we only get "American blueberries" here). They can't be domesticated, people gather them in forests.
They are quite intensively harvested in countries like Finland, Sweden, Poland and Belarus. The frozen berries are then exported. For instance where I live (Austria) I can buy frozen Bilberries at a much cheaper price than regular Blueberries.
If you think this is the worst offender, compare real tiny forest strawberries with that bland stuff from grocery stores. 5% of the volume, 300% of the taste. Even good ripe homegrown ones pale in comparison. Had a hike last weekend and hit the right spot of altitude and their ripeness, got stuck for an hour just nibbling on them along forest roads.
Folks go into the forests and harvest them, selling them to the stores. Similar story with cloudberries. They go for a fairly nice price. (They sell local produce in the major grocery stores here)
The rest of the year, though, large blueberries are all that are on offer if you are buying fresh. IIRC, I can buy both smaller and larger blueberries if I buy frozen.
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.