The cost of a visa is usually reciprocal between the countries. I don't know how much the US visa costs for chinese citizens, but I'd assume it was close to the charge for the USA citizen to get a chinese visa.

For what it's worth, i got my visa in one day by getting there very early and requesting same day service (additional $30 on top of the visa charge). It was easy but I went before the holidays when it was slow. Other people are reporting that the same day pick up is not an option because there is so much demand right now. Your best bet is the service, despite the fee.

Enjoy your trip.