I looked at the sticky Kefir post (looks like it has awesome recipes), but I still am unsure about how to get started buying kefir grains (they look like cauliflower?). Can I get the kefir grains from my healthfood store? I saw there is some kind of database for kefir grains online! Is there something different then about those kefir grains from what I can get at the store? Thanks for any clarification.