If you don’t care about the price, go to a shopping mall, such as Qunguang or Century China Merchants. If you want to buy something good-looking, you can go to a brand store, such as MIKEY. Nowadays, there are many chain stores that are more convenient and often have discounts, such as the one in Zhongnan.
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If you just want a good look, you can go shopping on Hankou Mouse Street and Xinxin Street. There are good-looking bags there and there are a lot of imitation bags. You can also find something you like!