As other people have mentioned in the thread White Mountain yoghurt is the real deal (I have no connection to the company). Real Bulgarian yoghurt proudly made in Austin, Texas :)

Joking aside, their yoghurt is superb. I don't recall yoghurt like theirs even in Bulgaria. Unfortunately you can't order directly from them but you can find if it's available in a store near you from their website http://www.whitemountainfoods.com