i got mine from someone on a yahoo group. there's one specifically for kefir making with LOTs of enthusiasts. i havent had my grains long enough for them to reproduce enough to send some away yet though.
I remember someone giving a link to a site to order grains on the "power of probiotics" thread in Health and healing. The thread should be on page 1 or 2 of health and healing. The thread is a WEALTH of information and is 19 pages long. I think the link was somewhere around pages 1- to 14.