Bus from Hong Kong to Shantou on 21 Oct 14 at 09.00

We are a group of six from Malaysia and shall arrive HK on 20/10/14. We plan to travel to Shantou on 21/10/14 and are interested to travel by bus run Shantou Tian Chi (Regency) International Travel.

Is there a way which we can book our tickets online for 09.00 bus? How much is the bus ticket price per passenger?