Des Moines, Iowa, might be the first market to test a standalone grocery store that is a cross between "an ATM and a very large vending machine," using a robotic system called Oasis24Seven, reports Ashlee Kieler of Consumerist. Grocery stores are increasing using technology to monitor shopping as well as tackle in-store theft. ... "
This idea has been tried before in a number of drive-through layouts. Examined this in 2006/07 in the form of the AutoCart Supercenter. Note the system described here is a very large vending machine rather than a supercenter store. The footprint is far smaller. The Robotics in either case can be done today. Stocking the larger form would seem to be far easier.