As of 2015, kefir can be purchased from Cultures for Health, Whole Foods, Walgreens and other private health food retailers. The availability of the product may vary by region.
Whole Foods sells kefir in packages of four individual servings each. Each serving in this case is 3.5 ounces. Cultures for Health is a manufacturer that produces kefir among other similar products. These products are available directly from the Culture for Health website, or in health food retailers across the United States. This website provides a store locator that allows users to find a nearby retailer of the product.
Lifeway is a kefir manufacturer. The company lists certain Walgreens locations in their store locator. Walgreens, however, currently does not list the product in their online inventory.