Domestically, the largest e-commerce site is Jingdong (JD.com). However, just that something is there does not translate to what is on the ground when one walks in and wants to see and try out. Still, it indeed represents what local vendors should be able to order for a try-out if they trust that the customer is serious. For using JD.com directly one needs a local person and it may be pretty hard finding anybody familiar knowledgeable about bikes, short of the offer above .