[bch]

If one is sufficiently motivated (and can utilize all the product), it's not hard to make ones own yogurt, with starter.

For that case, you could find your favourite local milk and make yogurt who's ingredients you are certain of, because you put them in.

http://www.wikihow.com/Make-Yogurt

[kolev]

This is true and might be surprising that Bulgarians are not accustomed to make their own yogurt, because stores are full of high-quality one that's cheap (unlike the $6-7/jar in the States). Kefir is also great and can also be made at home. My favorite is Lifeway [0].

[0] http://www.lifeway.net/Products/OrganicKefir/WholeMilkKefir/...