You won't find it for little of nothing unless you are a student -- even an OEM copy of Microsoft Word is normally over $100, though older versions might be a little cheaper.
Your best bet would be to find a copy of Microsoft Office Home and Student 2010 on sale somewhere. You can get a 1 computer keycard code at Staples (download the trial version from Microsoft to get the installer) for around $125 minus a coupon, or a boxed CD version with 3 computer license for about $140 minus a coupon (available from your preferred source).