Especially now when pregnant (Yay! 23 weeks!) I am missing Finnish Viili, a cultured dairy product a little bit like yoghurt but nothing like it anyway. I found a website in the US from where you can order fresh cultures, also for viili! What a lucky day. I will order some soon, it is now too hot (95F/35C tomorrow) for mailordering fresh dairy cultures. Here is a link to the Gem cultures. More about viili in Wikipedia. I will let you know how making my own viili goes.
Gem cultures sells also sour dough rye bread starter. We brought that with us from Finland, a 15 year old starter and we use it to make our own sourdough rye bread weekly. My husband bakes it so I guess I can't say "we" ;) The bread has only the starter, organic rye flour and water. It is good!