Which is a good shopping mall for buying radio controlled toys in beijing

As I know, the 4F of Wantong New World Plaza and 4F of Tianyi Market sell what you want.

The Wantong New World Plaza is at No. 2, East Street, Fuchengmenwai and the Tianyi Market is at No. 259, Wuchengmenwai Avenue. You can take the local subway line 2 to Fuchengmen Station and get out of the Exit D. Then you can see the first market I mentioned and then walk along Fuchengmenwai Avenue to reach Tianyi.