Amazon has been working for a while now to build out its shipping and distribution network. Now the online retailer has started coordinating its own shipments from Chinese merchants to its warehouses in the US via ocean freighters. The Wall Street Journal reports that the company doesn't own any ships, but it's working as a freight forwarder and logistics provider. These are the companies that reserve space on freighters and handle trucking shipments from port to a warehouse. WSJ says that Amazon has coordinated shipment of 150 containers from China since October.