Amazon has the Microsoft Windows 8 Professional Upgrade Version from XP, Vista and Windows 7 (3UR-00001) for $69 with free shipping. Includes a $30 promotional credit with purchase. Staples and MicroCenter.com are sold out for $40, but you can download it direct from Microsoft for $40 downloaded. Add Media Center for free. 
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you only get the ISO option if you download on win7.
$15 win 8 pro upgrade here http://windowsupgradeoffer.com/en-US
select date between June 2, 2012 and January 31, 2013
5% cash back with Discover card for online purchases this quarter. Must sign up.
I didn't know there were SO MANY ways to skin a cat.
is this Microsoft's way of marketing this product via all these merchants with all sorts of gimmicks - why is Amazon charging $69 when Microsoft is selling for $40 - why should I care about a $30 amazon gift card? am confused.
^Microsoft is selling Win 8 via a download, Amazon is selling Win 8 via a DVD disc. Downloading has it's disadvantages compared to owning an original disc from Mr Softy.
You don't get your $30 card from @mazon for 30 days after purchase.
Go to Staples to buy it. It have two disk one is 32 bit and the other is 64 bit. Window 8 is very good. Everyone should got this chance to upgrade from XP.
"Includes a $30 promotional credit..."
It's only displaying a $15 promotional credit for me.
If your close to a Microcenter, they are selling the same product as Amazon (retail Win 8 Pro Upgrade DVD with 32bit & 64bit discs & license key) for $38.88. In store purchase only.
http://www.microcenter.com/single_product_results.aspx?sku=077859
As Aweston stated, if you purchase a new PC, you can get Win 8 for $15.
I've seen some who have tweaked the Windows 8 interface to bring back the start menu and other older Windows features. If that's the case, staying with Windows 7 seems the better option unless your running XP or Vista and want a cheap upgrade.