Windows 8 Pre-order

1. $14.99 (no DVD, upgrade), If you buy a qualifying Windows 7 PC between 2 June 2012 and 31 January 2013, you can purchase a download of Windows 8 Pro at a special promotional price that varies by region.

2. $39.99 (no DVD, upgrade), if you want to wait until October 26th you will be able to upgrade online via Windows.com using the Windows 8 Upgrade Assistant. Upgrade from Windows XP SP3, Windows Vista, or Windows 7 to Windows 8 Pro.

3. $69.99 (packaged DVD, upgrade), Pre-order from now to October 26th.

4. $69.99 (no DVD, upgard), Pack Product Key only, Pre-order from now to October 26th.

5. $99.99 Windows 8 (Full Version).

6. $139.99 Windows 8 Professional (Full Version).

Reference from: http://blogs.windows.com/windows/b/bloggingwindows/archive/2012/10/12/reserve-your-copy-of-windows-8-pro-and-pre-order-windows-8-pcs-today.aspx