For those of you interested in getting a major discount on Windows 7, Microsoft is going to offer the Home Premium Upgrade and Professional Upgrade versions for $49 and $99 respectively. This is a pre-order, not an early purchase with delivery before the official release date.
They will be available starting tomorrow, June 26th. You can see the announcement here: http://www.microsoft.com/windows/buy/offers/pre-order.aspx
I’m pretty sure the offer only applies to the US.
You can order through Best Buy, Amazon or online at the Microsoft Store.