Hi nicobria,
Please be careful on placing your trust, as anyone can claim to be a sourcing agent and you really need to investigate, to look at all evidences that indicate you will be dealing with the right person. I have seen several offering this service but will cite only one that seems to be fine (still needs to be scrutinized though) -
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Domain Name: AMANDAIEC.COM
Created on: 25-Dec-07
Expires on: 25-Dec-15
I haven't encountered any complaints nor negative reviews about them online and some people have the same observation, as shared in a forum Link hidden: Login to view
Please be reminded not to send any cash using Western Union, and that SaleHoo does not guarantee safety/reliability of any company outside its directory.
Member kieshag mentioned in a past forum post that she uses a sourcing agent in China, Link hidden: Login to view :)
Best of luck to your endeavor. :)