I don't mind paying more for quality, especially where food is concerned. I aim to eat healthy and I like the idea behind "bio" and "organic" production. But I haven't seen any strict definiton of these two labels and I feel like people are buying that stuff just because of the words. Maybe I'm pessimistic about the future and it makes me sad that we need such labels at all. When I was a kid, a lot of what we ate was what bio and organic are supposed to mean, and that was the norm. Then stuff happened, milk was no longer milk, juice is no longer juice and now, because the new stuff is bad, we rename the _old_ stuff. That's what I don't like. Call it nostalgic old-man ramblings :)
The milk vending machine is this: http://vbox7.com/play:2838ba0e39 and it's located on 10 Cherni Lom str., right near one of the bus stops at the railway station. You can find it on google maps and when you get there, you'll see it outside the building. You can bring your own bottles or buy from the guard in the building. He also has change if you don't have coins. If you go, try to go before noon, because sometimes the milk is sold out by 2-4 PM. It's 1.5 lv per litre and of course, you should boil it before you drink it.
I'll mail you the map and directions for the farm :)