This might not last, but heck, im sure Microsoft wants 8 in as many hands as possible....

First.. Go here..

http://www.windowsupgradeoffer.com/en-US

then Register a PC (just enter any info you want, you dont even have to own a PC to get the info you need).... it will give you a thank you and a registration receipt. It will also send you two emails, one with the reg receipt, but one with the all important PROMO CODE...

check your inbox about a minute later.. the promo code email will be there...

It will say the following:

Congratulations! Here’s your Windows Upgrade Offer promo code for Windows 8 Pro. Purchase and download your upgrade now. PROMO CODE - XXXXXXXXX

Next Steps Running Windows 8 Upgrade Assistant helps you know if your PC is ready for Windows 8, provides you with a compatibility report, and then walks you through the steps to purchase, download, and install Windows 8 Pro, right from the Upgrade Assistant. Important Notes: • You’ll need to run the Windows 8 Upgrade Assistant on the PC you want to upgrade. • Once you get to the purchase screen, it will show the full price. However, on the order confirmation page you’ll have a chance to enter your promo code – then the price will change to your Windows Upgrade Offer promotional price* after clicking apply.