Located in the center of Shanghai, near Nanjingxilu, you can find many good bargains in this wholesale market. Make sure to bargain, though. Some of the vendors can be quite aggressive and chase you down if you don't honor the price. Like many bazaars, it is ridden with pickpockets, so watch your belongings.
Where does this market get so many famous brand products? Are they fake? If they are fake, they do a really good job with it, because they even have tags with the right designs and the right English.