Are automated convenience stores and can be found on most corners of the downtown Chicago area. Each has their own inventory and stock. Prices may vary depending on the locale as well. Most will carry an assortment of Second Generation MRE’s and/or various beverages.
In more populated centers they have even been known to contain articles of clothing, tools, and weaponry. So long as you can pass the background checks.
Some Vend-O-Matics, those notably set up in less than reputable areas of town have been known to carry various Drugs of varying LCs. Often such products go quickly and as such are difficult to track.