If you're just wondering what all-black snakes are available for purchase in captivity, there are a few.
Ones I can think of off the top of my head are:
Melanistic Eastern Garter Snakes
Black Milk Snakes
Mexican King Snakes
Black Rat Snakes
As for Eastern Indigos, they are difficult to purchase and rarely found being breed because they are classified as a "threatened" species. Only a few states require permits to keep them as pets but a federal permit is required to purchase them out of state within the United States.
EDIT: Super Cinnamons are not actually black. They are typically more of a brownish grey and seem to get lighter with age.
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