Where can I buy tickets for shuttle bus line 2 from West of Jishuitan Bridge to Capital Airport?

Dear Mart, shutle line 2 doesn't stop at West of Jishuitan Bridge on the way to PEK. You can take metro line 2 from Jishuitan to Yonghegong Lama Temple Station. Then, you can buy the ticket of shuttle bus line 2 near Exit B, and take the bus there. It costs CNY 18. The buses operate until 21:00. :)