I have half-a-dozen small jars of frozen kefir grains. These were grown in (mostly) organic and/or A2 milk. They can remain frozen until you're ready to start your own culture. Plenty of info online about how to use them, and I can also share what I've found useful over the years.
For those who might wish for more information about kefir: https://revolutionfermentation.com/en/blogs/milk-kefir/the-fascinating-orig...
Milk-Kefir “Grains” (north Lake City)
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