Authentic Kalamata olives from southern Greece that have been cured using red wine and / or red wine vinegar are available in many groceries, especially those groceries that stock specialty foods.
In the U.S., many canned and jarred olives are referred to as «Kalamata - style» or «Kalamata - type» olives and these olives are not authentic Kalamata olives grown in the Kalamata area of southern Greece.