In fact, the prices are almost the same (the price difference will not exceed 50 yuan). Unless you have a DFS discount card (general travel agencies can book it for you and check the card issuance at the DFS front desk), you can buy it in Zhuo Yue, Yashi, SASA or Watsons. Because Hong Kong used to be British, there will never be fakes passing through futures, and there are frequent activities in these places, so you can buy very affordable things.