This thread is so interesting. I am on the lookout for kefir, but haven't had any success yet. I searched Craigs list, our local "free cycle". I found it on Amazon, Has anyone bought it on Amazon? Are they a good source for it? Any other suggestions? I am so excited about getting started. I do have a source for raw milk. Just my husband and myself so it sounds like a good way to use up our left over milk. Keep up the posts with all the great recipes!