An automated fulfillment unit for a mobile storage and retrieval system, configured for dispensing products on the move for on-demand electronic commerce to enable increased operational capacity and speed of delivery to customer orders. The mobile automated fulfillment unit includes a vehicle having a storage for storing products and having a compartment separate from the storage, a robotic conveyor mechanism configured to move products from the storage to compartment, and a communication subsystem configured for at least mobile communication and for receiving customer orders.