try alibaba and google. Actually, you can put your products on alibaba and buyer will contact you. It is very good.
For google, you can use searching function as 王铮 told you. But it will take a time to check if the buyer is the right one you are looking for. 2008-3-31 16:40:04
in the search box input company name , name + TEl Fax, name + address, name + contact person.which can get from alibaba, global source, made in China, etc famous B2B platforms
www.globalexport.net is a free B2B website, Via which you can search about 5 available free buyers informations once register.