edit: deal is over
So here’s the deal, purchase Microsoft Office 2004 Student/Teacher on Black Friday from any retailer and get a $100 off coupon from Microsoft plus a free upgrade to Office 2008. The best place to buy Office is Amazon: Microsoft Office 2004 for Mac Student and Teacher where it is $125.
The rebate is downloadable here. And find more information here and here to show that it is legit. If you can’t buy it from Amazon, any other retailer is fine but you may not get free shipping nor find it for less than $150 before rebate.