What are the costs involved in a climb the Mt. Hua? I know China is getting very expensive with their scenic spots.

The entrance and the transportation fee in the attraction is 180RMB per person during the peak season.
For the transportation, it is hard to tell you the price in exact. I traveled by bus from Xian Railway Station and the bus fare is 22RMB.
For hotels, living condition on the peak is not good. The price is different from 100 to 200RMB or more higher for different rooms or beds.
For the parking fee, do you mean park a car there? I am afraid that I am not very clear about it.