Here are the top four C2C online shopping websites in China according to CNNIC with market penetration rate,
Taobao.com: 81.5%
Paipai.com: 10.5%
Youa.Baidu.com: 2%
Eachnet.com: 1.8%
Online shopping Penetration Rate by City
Online shopping top B2C websites
China Online Shopping Report 2009