Official Pricing
Windows 7 Home Premium: $120 for upgrade; $200 for full version
Windows 7 Professional: $200 for upgrade; $300 for full version
Windows 7 Ultimate: $220 for upgrade; $320 for full version

Pre-order starts on June 26, 2009 with limited time special pricing on upgrade version.
Windows 7 Home Premium - $50
Windows 7 Professional - $100
Windows 7 Ultimate - No Discount
You can pre-order in store.microsoft.com and most major retailers.

Free Upgrades If you buy a computer after June 26th,2009. Make sure you check with the store.
-Windows Vista Basic won't get a upgrade
-Windows Vista Home Premium will be upgraded to Windows 7 Home Premium
-Windows Vista Vista Business will be upgraded to Windows 7 Professional
-Windows Vista Ultimate will be upgraded to Windows 7 Ultimate

Windows 7 will be avaiable on October 22, 2009