12. Amazon Buys Zappos

Sale Price: $1.2 billion
Year: 2009

Zappos.com made its name offering an old product (discount shoes) to an new market (online shoppers). By 2009, it was the largest online shoe retailer in the world, and had expanded to offer all kinds of clothing and accessories. That year, Amazon announced that it had acquired its younger competitor for $1.2 billion in an all-stock deal.