The website I recommended, Fermented Treasures, isn't offering milk kefir grains. I thought I ordered them from there. I checked another place, Gem Cultures, and I believe that is where I got them. They are quite pricey now at $22, whereas when I bought them they were $14 I think. You can also check ebay- I ordered both kefir grains and kombucha scobies from someone that way before.
For more info about kefir, please go here to the most extensive website I have ever seen on a subject!