sightseeing bus in Beijing

As far as I know, there is no sightseeing bus in BJ like that in Shanghai or HK. I only know there is a kind of sightseeing buses operated by City Bus Tour Company and this bus starts from the cross bridge of Guomao.
The buses leave at 09:30, 10:00, 14:00, 14:30, 19:00 and 19:30. The bus fare is around 380RMB per person.
I think you can find more detail information on their official website.

Thank you for this information, but I was referring to the sightseeing bus in wangfujing? Do you have any information on the sightseeing bus in wangfujing?

The sightseeing bus of WFJ starts at the south part of that street and the starting place is close to the cross road of WFJ Street and Dongdansantiao Street.
The whole journey takes around 40 minutes and the ticket fare is 30RMB.
For the place to buy the tickets, I am not very sure. I think you can go to the starting point to have a look.