Alibaba and ali express both together have opened the doors of online whole sale shopping.before alibaba, online shopping was always retail oriented only.but now you can buy a full crate of products and that too directly from china.
Pros:
Competitve pricea .Chineese sellers on alibaba provides products for the cheapest pricr ever.
Oem feature: they would print your brand name in the products if you order them in bulk.
Cons:
Risk.shopping in alibaba is risky only because its international.you are sending money over seas to someone you dont know at all.