I think some chinese dealers not only rise their price for foreigners but also for chinese. I can think argy-bargy a part of chinese culture, especially in small roadside shop or in bazzar

Charlotte, Bargaining is an important part of shopping and doing business in China. You should bargain for everything from water to jewelry. Any place where the price isn't clearly marked is an opportunity for bargaining, and even sometimes when the price is marked you can politely ask "is there a discount?" This is another way of saying, is the item on sale?. If you're really worried about this, and/or plan to do a lot of shopping, you may want to try this service: www.shopmyshanghai.com. Enjoy!

Sometimes i would like shoping to some shops.I feel it is so interesting that haggled with vendors.if you in beijing ,i will help you to haggle. Also you can ask a stanger to do it.

It depends on where you want to do your shopping.. If you go to the supermarket or shopping mall, you don't have to worry about the prices, cos the prices are all on the products.. But if you go to some shops along the streets, they may raise the prices when they recognize you as a foreigner..If you ask a stranger to come and help translate, i think he'll do if his English is good. But if you don't ask for help, i don't think they'll come...

http://www.shanghaiexpat.com/MDForum-viewtopic-t-22177.phtml Lot of info about this stuff.