KEEFE Supply Company, in St. Louis, MO – Sells snacks and junk food.
American Amenities, located in Woodinville, WA – Sells hygiene items.
JM Murray Center, Inc. in Cortland NY – Sells toothpaste.
Four-in-One Co. Inc. in Mountainview, CA – Sells salad dressing and mayo.
Heinz Co. in Pittsburgh, PA – Condiments, etc.
Ascent Battery Supply LLC in Harland, WI – Sells batteries.
Medique Products in Ft. Myers,, FL – Ibuprofen and other medical supplies.
It goes without saying that the companies who sell their products in prison canteens make millions of dollars off the most perverse kind of monopoly capitalism imaginable.