I got my partner some organic live milk kefir grains for Xmas, and the little darlings are proliferating at such a rate that we now have a few batches to give away to anyone interested in home-grown probiotics.
I bought them from Amazon originally, so the link for what you're getting is here: http://amzn.eu/9OtlgSA
Tons of sites have instructions on how to grow kefir, but you could start with this one if interested: goo.gl/beyrvM
You'd need to bring a container to collect them in. Please DM me if you're interested or if you want any more info!
Thanks and best,