Generally, eastern China is much more expensive than the western part of the country. The main drain on savings tends to be long train journeys. However, the bottom line is that you'll be charged the 'tourist price' a lot of the time - it's a practice encouraged by the government. Foreign currency and travellers' cheques can be changed at the main branches of the Bank of China, the tourist hotels, Friendship Stores and some department stores.
Hotels usually charge the official rate.
You will need to keep your exchange receipts if you want to change any of your remaining RMB at the end of your trip. Cards can be used in most mid to top-range hotels, Friendship and department stores, but cannot be used to finance your transportation costs. You can bargain in shops, street stalls, and hotels - but not in large stores. We encourage you to verify any critical information with the relevant authorities before you travel. This includes information on visa requirements, health and safety, customs, and transportation.