It's sold at Vitamin Cottage for about $10. - (it's more expensive at Whole Foods, buyer beware!). I've been drinking 2 Tbsp a day, and getting really good results. I'm going to start giving some to Francis, my dog- it's pet and kid friendly too!
A little bit of info from their site:
"...dairy-free, gluten-free, soy-free and certified vegan beverage. ...hand crafted and made in small batches using freshly harvested coconut water from young green (less than six months old) coconuts at the peak of their nutritional life..this kefir is a living food created to build and nourish the inner ecology of your body...employs the process of fermentation to create its Coconut Water Probiotic Kefir. Fermentation is the biological process that occurs when specific (probiotic) bacteria cultures are introduced to the water of the young green coconuts under controlled processing conditions. Coconut water makes the perfect fermentation medium because its naturally occurring carbohydrates, including sugars and fiber, provide food for the bacteria and stimulate their growth. Under these optimum conditions, the health-promoting bacteria are able to grow or culture, leading to exceptionally high culture counts of up to trillions of probiotic bacteria per serving."