Amazon earlier this morning announced the official closing of the acquisition of Zappos, a deal which we broke the news about back in July. Turns out the valuation of the online footwear and clothing retailer went up a bit over the past few months too – thank you, stock market – and Zappos turns out to have been deemed worth $1.2 billion by Jeff Bezos & co.

Zappos CEO Tony Hsieh writes in a public letter:

We’ve been spending the past few months obtaining all the proper government approvals, and I’m happy to say that we officially closed the deal at the split second between Halloween (10/31/09) and All Saints’ Day (11/1/09). From a practical point of view, we’ve switched out our previous board of directors with a new management committee that is composed of people from Zappos as well as Amazon.

Our investors and other shareholders exchanged their Zappos.com shares for approximately 10 million Amazon.com shares. Given the closing price on Friday, 10/30/09, for Amazon stock, those shares were valued at approximately $1.2 billion at the time of close.

As expected, th