you can go to qiujiang road. you can take metro line 4 and arrive baoshan road. the street is full of junk stuff, including electronics stuff. on the east side (you walk east several hundred meters), there is a building called seg. there are some shops selling ham radio equipment, but most of them are uv band radio and antennas. you might see some hf radio there, but only a few.
btw, it is interesting that i am on a business trip to machida city, tokyo, and i am searching for ham shop nearby also. i know akihabara, but it is a little far away. do you know some shops nearer? i am most interested in qrp and diy kits. thank you.