Can I get Chinese sim card in all place and at what cost?

Yes, you can get the sim card from the branches of China Mobile, China Unicom, or China Telecom. There are many of them in downtown and you caneasily find oe. As for the cost, it varies from one company to another, and from one combo to another. Generally speaking, CNY 100-200 will be enough per month if you don't call much.