If one wholesaler doesn't have a an item, you looks elsewhere. Normally, they advertise the products on their websites or any selling sites each day a customer pays for it, a robust is ordered and paid by the vendor to producer. Then, make the order to your wholesale drop shipping company. https://ecampus.smu.ac.kr/local/ubonline/view.php?id=63121&returnurl=aHR0cHM6Ly9icmFuZGFmeS5jb20vYmxvZy9kcm9wc2hpcC1lbGVjdHJvbmljcy8/ZD1EZWFkcmVja29uaW5nZ2FtZS5jb20lMkZpbmRleC5waHAlMkZIb3dfVG9fTG9va19Gb3JfQV9SZXB1dGFibGVfRHJvcHNoaXBfTGlzdA