Bolsjehuset has some of the most genuine flavors you can get. They taste soo good, and have great prices :D
And if you worry about Diacetyl in the flavors, there are only 4 flavors that contain trace amounts of Diacetyl;
Flødekaramel + Fløde-Creme + Jordbær + Bali .
All others are cleared ;)
