The rumour a few weeks ago that Amazon was about to buy Ocado was pretty interesting. While almost every supermarket chain in the UK offers delivery, Ocado is the only one that is online-only without physical stores. They have a big infrastructure with warehouses around the country, but most importantly they have excellent software, which they white label for other companies. As well as jumping into the UK grocery delivery market (which is the most mature in the world), they'd also get their hands on the technology to take it to other countries.