Dear Nelson Every,
Thanks for contacting Top China Travel!
Sorry, we do not offer bus tickets booking seperately. It must be conbined with tour package service. You may buy the ticket upon your arrival in the bus station. Main bus stations in Changsha has buses leaving for Zhangjiajie every day, such as Changzhutan Bus Station, Changsha Dong Bus Station(Changsha East Bus Station), Changsha Xi Bus Station (Changsha West Bus Station). Changsha West Bus Station is a little far from downtown.
It is recommended to take bus from Changzhutan Bus Station, which is just across to Changsha Railway Station. Changzhutan Bus Station is centrally located in Changsha downtown, and enjoys convenient public transportation. The English address is #339 Chezhen Zhong Road, Furong District, Changsha (Chinese address: 芙蓉区车站中路339号). If you come from Changsha South Train Station, you may just take Subway Line 2 to get to the bus station directly(you need to get off at Changsha Railway Station). It is conveninent to reach. There are about 8 buses travelling from Changzhutan Bus Station to Zhangajiajie.
Any further request or question, please feel free to contact with us.