There is the other Best source related on Kefir grains, you can buy it on:
http://www.howtomakekefir.com/
Below I'll give you the preview of that page:
These live grains have been born and raised in fresh organic cow milk. They are healthy happy and ready to give you the best source of probiotics in the world.
Love them and take care of them properly and they will last you a life time. Only a one time investment.
Comes with 1 Tablespoon, all you need to get started and they will continue to grow and grow.
The price is $9.00 + shipping
Once payment is recieved grains will be shipped out in one to two business days.
To your health,
MP
http://www.howtomakekefir.com/