BingoBox has had automated convenience stores in China for months now.[1][2] They're about the size of a shipping container. Amazon is coming from behind here.
[1] https://www.youtube.com/watch?v=4vIt0lTcqaw [2] https://youtu.be/l7DLmBYk6c8
[1] https://www.youtube.com/watch?v=4vIt0lTcqaw [2] https://youtu.be/l7DLmBYk6c8