Bargaining in China

In China,people normally do bargain in many stores if the stores are permissive.I have tried to do it for many times.But I usually do not bargain for the cheap things,such as the food.Instead,I bargain the clothes often.When I'm going to buy some expensive things,such as the electronic products,I will take along my friends or my relatives to help me.Because I am unfamiliar to these products.