Was watching CBS this morning, a US news update.
They had this business covered, and how m-commerce and e-commerce has taken off in the US.
Fresh Direct (been around over a decade and doing really well):
https://www.freshdirect.com/welcome.jsp
Amazon Fresh was a competitor (been around 8 years):
https://fresh.amazon.com/welcome
http://en.wikipedia.org/wiki/AmazonFresh
I think M-Commerce is the next big and growth sector.