If you are planning to upgrade your windows to Windows 8 , it is better to do it before February 1 , 2013, because Microsoft announced a huge change(almost 4 times) in the upgrade price.
Windows 8 upgrade editions will be priced as follows starting in February:
The Windows 8 Pro upgrade edition will be available online and at retail for $199.99 MSRP (U.S.).
The Windows 8 upgrade edition will be available online and at retail for $119.99 MSRP (U.S.).
The Windows 8 Pro Pack will cost $99.99 MSRP (U.S.).
The Windows 8 Media Center Pack will cost $9.99 MSRP (U.S.).
Read more here
Offers limited to five upgrade licenses per customer. To install the Windows 8 Pro upgrade, customers must be running Windows XP SP3, Windows Vista, or Windows 7. The prices displayed are estimated retail price and the transaction may be completed in a different currency. The actual price of the offer will vary by region since it is dependent on a variety of specific factors including exchange rate, local taxes, duties, fees, local market conditions, other pricing considerations, and may vary by each independent reseller. The actual price you pay may be more than the advertised price due to these additional factors. Shipping and handling charges may apply to packaged DVD product.
When moving from the Windows 8 edition to Windows 8 Pro via the Windows 8 Pro Pack – you receive the Windows 8 Media Center Pack and won’t need to install it separately.
The last day to register for the Windows Upgrade Offer is February 28th, 2013.