Craigslist
Actually, I bot my home copy of Office 2003 Pro thru the classifieds in the paper. I waited until 2005 and found somebody willing to part with their CD and license for a deep discount. It works fine. You can find similar ads in Craigslist.
Around the same time, I didn't set my Dad up with 2003. He really didn't need or want it. Instead I set him up with OpenOffice. It was free and did what he wanted.