The main buzz kill will be the shipping charges, and probable customs charges for a new product. These sites sometimes use an intermediary for shipping, who want their cut as well.

There are also auction sites a well. One example - http://www.rinkya.com/new/en/Bicycle...category-26222. Some of the language can be confusing, i.e. - 'cars' are frame, and 'crack' usually means scratch.