Buy in bulk. According to the information of JD.COM and Rainbow, we know that JD.COM bought JD.COM in bulk, so it is cheaper than Rainbow. JD.COM Mall is genuine, so you can buy it with confidence. As for why the price is cheap, it is very simple, because people buy a lot of goods, and the price is of course low. Buy low and sell low. Moreover, JD.COM only cooperates with large enterprises, many of which purchase goods directly from manufacturers, with few intermediate links and even lower prices.