Oh I just found an article last night on bargaining with the locals. It might be a decent jump off point for you to learn.
I apologize if we aren’t supposed to link other sites here. If that’s the case, please delete 🙂
http://www.jazzviolin.com/china/2007/09/29/buying-things-how-to-negotiate-bargaining-in-china/
I also found this app.. Maybe someone else has used it? It’s supposed to help you find where you want to go, and then writes it for you to show your taxi driver.