Want to know a big reason why Amazon is doing well these days? According to this article:

Sales rose 33 percent to $851 million, helped by growth of some 90 percent from its international sites, most of which was powered by its Japanese unit.

As a result, Amazon has just added a marketplace to the Japanese site:

The amazon.co.jp website, the fastest growing of the company's sites outside North America, said it hopes nearly a quarter of its more than one million active users would come to use the second-hand goods market service.