Best Buy: Free MS Office For Mac 2011 With Apple Computer Purchase
Best Buy has a sweet deal if you are a student and purchasing an Apple computer for school. When you purchase an Apple computer either online or in store you will get Microsoft Office For Mac 2011 for free, worth $129.99.
It looks like it will be automatically added with your purchase. This offer is only valid through the 15th of August, 2011.
While I love Pages for making invoices and my general word processing needs: when it comes to essays and reports I use Microsoft Office for Mac. I have a 2007 version (that I actually really hate) but I don't want to risk any compatibility errors or marks for the wrong formatting (such as margins, font, spacing, etc). Microsoft Office does the job.