If you know eBay, I sure you also know about Dropshipping business model. From wiki, Dropshipping is a supply chain management technique in which the retailer does not keep goods in stock, but instead transfers customer orders and shipment details to either the manufacturer or a wholesaler, who then ships the goods directly to the customer. As in all retail businesses, the retailers make their profit on the difference between the wholesale and retail price.

Thanks for Shane O’driscoll