I just did my pre-order. If only I had been picked to host a Windows 7 party!
If you live in the US and you are a college student, then head here and get Windows 7 Home Premium or Pro for only $30. If you want a disk (for clean install or upgrading from XP), then it will be an extra $13. At any rate, this is the best deal you are going to get. I ordered mine just now, but the promotion ends Jan 3.
http://windows7.digitalriver.com/