Choose Alibaba / Taobao for your business.
Alibaba.com is the leading platform for global wholesale trade serving million of buyers and suppliers around the world. Most of the members on Alibaba.com are manufacturers or trading companies or resellers who trade in large order quantities.
Where as AliExpress is a global retail marketplace targeted at consumers worldwide. Offering quality products at factory prices in small quantity. Your order amount can be as low as 1 item and you can pay safely using Buyer Protection service.
You might wanna check this out http://www.saporedicina.com/english/alibaba-vs-aliexpress/
On the other hand, do a research on “Wholesale taobao buying agents” as well. (be careful)
Good luck!