Zhōngguāncūn is China’s Silicon Valley, and Zhongguancun Dajie and the streets around it are home to many malls selling digital and electronic products. This is one of the biggest of them, an eight-floor space full of vendors selling reasonably priced computer software and hardware, games, mobile phones, MP3 players and iPods.
Not all of it is the genuine article, but you can bargain here. Go to the 2nd floor for laptop repairs. There's a food court on the 8th floor.