How much is it to enter the tombs?

Do you mean the entry ticket? There are 13 tombs there and different one has different fare. The most popular ones include: Changling (CNY 45 in high season and CNY30 in low season); Dingling (CNY 60 in high season CNY40 in low season), Zhaoling (CNY30 in high season and CNY20 in low season). Sacred Way is not a tomb but is very frequently visited; its entry ticket is CNY30 in high season and CNY20 in low season. High season here is from April 1 to October 31; the other time is the low season.

BTW, the entry tickets mentioned here are the oridinary ones. There are also the types with stamps. They are all CNY5 more expensive.