Just outside the Second Ring Road in western Beijing, there's a multitude of discount markets that sell everything from tools to toys. There are some great prices on clothing and small electronics, but be prepared to haggle to get the best price at any random stall. The biggest and most comprehensive markets in the area are Wantong, Guanyuan and Tianyi.
Traffic: Subway Line 2, Fuxingmen or Fuchengmen Station