When you have already got a buyer for a small item, it's the only time that you have to place a purchase order from the drop shipping spet. This is generally because they slip into drop shipping without actually knowing what it's all about. http://Yensaodaigiaphat.com/index.php?language=vi&nv=users&nvvithemever=t&nv_redirect=aHR0cHM6Ly9JRC5Db250YWluZXJpemUuY29tL3NpZ251cD9jbGllbnRJZD1wcm9kLmRpc2NvdXJzZS5hc3Bvc2UmcmVkaXJlY3RVcmw9aHR0cHM6Ly9TaXRlcy5nb29nbGUuY29tL3ZpZXcvYmVzdC1kcm9wc2hpcHBpbmctc3VwcGxpZXJzMy9ob21l