I hate to break it to everyone but Walmart has had it's own ships for the last 12-15 years. It was the only way they could guarantee timely delivery and stable costs, even when things were normal. For some reason the media thinks Amazon is doing something innovative? There is nothing innovative about charting your own ships and buying your own containers.
Now selling stuff at a loss for over a decade and a half to hook the public and then raise prices quietly to where it's less expensive to buy from brick and mortar is the real innovation. Who would have thought a company could do that for 15 + years.