It may seem odd that Amazon would carry a product (albeit through a third-party retailer) often referred to as the "Kindle killer" in its store -- especially after disparaging said product in a recent slew of TV ads -- but financially it makes a good deal of sense.
Not only is Amazon poised to profit directly from sales of the highly popular device, but also from sales of its e-books via the Kindle app for iPad. Since the Kindle app is arguably superior in both functionality and inventory compared to Apple's iBooks app, each iPad sale presents a new opportunity for Amazon to expand its e-books business as well.
After all, Amazon's e-books strategy hinges on selling actual e-books rather than selling e-readers; consequently, the company has worked hard to brings its Kindle app to as many platforms as possible, including Mac, PC, iOS, Android, BlackBerry, and, most recently, the web.