Amazon.com’s secret retail empire

Jeff Bezos has a loud laugh. But Amazon.com’s founder and CEO is keeping quiet about his expansion efforts, which now include sites as varied as BuyVIP.com, Zappos, and as of Monday, Diapers.com.

Will Diapers.com buy prove taxing for Amazon.com?

Amazon.com is poised to buy household-goods retailer Quidsi, the parent of Diapers.com, on Monday for $540 million in cash and debt. (Update: On Monday, Quidsi confirmed the deal with VentureBeat.)