On Japan's Mercari marketplace, the base 256 GB model sold for $5,400, sellers on China's Taobao are asking $5,000 and there's one seller on Singapore's Lazada seeking $6,300 for the device. In Hong Kong's bustling Mong Kok, an electronics importer specialising in getting gadgets early, asks for $4,580, with the price shifting on a daily basis. His advice: best to wait.