Yiwu is a city in Zhejiang, 100 km south of Hangzhou.
If you take bus, it leaves about every 1 hour and available at various long distance inter-province bus stations ( called chang tu ke yun zhan in Chinese) . Some stations got more schedules than others. Make sure you know which station you are going to. Again, the hotel staff should be able to give you directions. You may want to go to either the general station ( or Ke yun Zong zhan at No. 1662 of Zhongxing Road) or Pacific Station (tai ping yang station at No. 710 Hengfeng Road.) Actually buses are just fine if you don't get car sick. If you want more comfort and privacy, it costs about 150 USD including all road tolls. It's actually quite economical too, if you come in group of 2 people or more. Best Way to go to Yiwu