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Collard greens are widely available in Indiana in both conventional supermarkets, greengrocers, farmers' markets and the like. I can't remember NOT seeing collards available in almost all places from time to time, and practically all the time in some.  Less available in Chinese/"Asian" markets where those places concentrate on their own kinds of vegetables, but readily available in "International" and Western Hemisphere markets (Mexican, Central American, etc). There are also hydroponic growers (some are very large scale operations) in both the Chicago and Indianapolis areas which grow collards – some year-round, some in rotation – and these are often supplied as whole plants, to a wide clientele including restaurants and the general public/certain markets, usually more etiolated and smaller-leafed than conventionally soil-grown collards where the cut leaves are usually offered. Collards are a common offering at farmer's markets, and in Spring baby collards (either the young tender tops or the small tender developing leaves) are popular.