Adding one more location to your itinary;p 上海市梅园路360号环龙摄影器材城
So far only been to 星光摄影器材城. There are 5 floors selling all sorts of camera equipments both new and used. Some used items are a good buy there. Accessories are definately cheaper there like Benro tripod and especially those made in China. Can spend hours there like a child in a candy store.