If you want real jade you willhave to pay around 300-600 yuan. However you can get some cheap knock offs all around Shanghai. For the best experience go to the fake market on west nanjing road. It looks like an office building but a market is on the first 4 floors. Also you can find some cheap jewellery in the underground shopping mall at the people square stop. If you head to exit 11 there are heaps of small stores all around there and u can usually finds some nice jade (not real) for about 10 yuan.