The Terracotta Soldiers are 30kms outside of the city of Xi'an (or also sometimes written Xian). The many hotels and hostels will offer a half day tour to the place from 160-250 RMB depending on how nice your hotel/hostel is...
Other options to get there:
Bus : Go to the Main Railway Station - and it sites just outside of the North Gate of Xi'an. Facing the station there is a bus station area on your right hand side - about 50-100 meters away. Take local BIG GREEN bus 306 and will take you direct to the soldiers (it does stop along the way for other passengers and other drop offs - BUT it is the most direct route. The stop is the LAST stop which will take you about 100m from the main gate. Price is 7 RMB or 6 RMB if you have your international student card (one way). Takes about an hour.
You can also take bus 914 which takes a much different route and is a bit longer and crazier in roads. Also costs 7 RMB. NOT recommended but is possible.
NOTE---> There are also mini green buses with a number of 306 on them - they are fake and will take you on a tour of shopping stores taking you perhaps 2 hours to get there. Have no idea of the price.
Many of the bus routes go to the Railway Station. From the South Gate take bus 603. The cost of the local bus rides are 1 RMB - or 2 RMB if they have airco. You will know if they do as they have a picture of a snowflake on them.
TAXI: You can take a taxi at a negotiated price from 450-600 RMB. Depends on how good you are at bargining.
The local BIG GREEN bus is the most recommended and cheapest option. This is VERY easy and NOT hard at all to do.
Price for entrance is 90RMB for adults or 45RMB for students (with card). The price for entrance is 65RMB for low season - don't know when that is. You can get a audio guide for 40RMB (30 for students).
Here in China our students cards have saved us a load of cash.
TIP: Go earlier in the morning as there are much less crowds. After midday the amount of local tourists really is quite crazy and noisy. Watch the movie of the soldiers first so you get a chance to know a bit more of the history. There are 3 pits, go in this order: 3,2,1. No 1 being the biggest and most wonderous so nice to see this as the final WOW.
Ciao for now !
