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Bainaohui Electronics Market 百脑汇电子市场
8 Chaoyangmenwai dajie, Chaoyang 朝阳区朝阳门外大街8号
Though subpar to Zhongguancun, Bainaohui has a wide electronics selection and a good reputation. The six floors contain computers, cell phones, MP3 players, gaming systems and more. Most vendors start at reasonable prices but bargain anyway. Get a receipt and a store card, so you can exchange items without problems.
Open daily 09:00 to 18:00.