I want to buy professional drones-quadcopters in Shanghai such as the model Cheerson CX-20.

I have no idea of a store with this object. But the 12th Modle Exhibition will be held on Aug. 22-24 in the city. You probably can find the drones-quadcopters there. If you are interest, it will be held at the CECIS, located at No.2739 West Guangfu Road, in the center of Changfeng Ecological Business District. It is within walking distance to Daduhe metro station of line 3 and you should leave from exit 1.

Hello! Could you find a shop for drones in the end? I am looking for drones as well in the city. Thanks!

Dear Viktor, the International Exhibition and Forum UAV will be held from June 14 to 16, 2016 at the New International Exhibition Center at No. 2345, Longyang Road. You will find many drones there. :)