you might be abkle to get a copy off of Ebay for not much money, but of course it may not be a legit copy. So you could fork out for a new version which can be pricey. The cheapest way I've found of getting Office and Project is by becoming a Microsfot Partner for something like £200 a year and get the Action Pack. (bearing in mind that full retail for Office plus Project is £343 (on sale) for Office and £469 for Project.)
https://partner.microsoft.com/UK/program/managemembership/actionpack/mapscontents
You get about 20 licences for varying versions of Vista,
10 licences each for Office, Project, Visio, Sharepoint, and Outlook
and a ton of other bits and pieces including server side stuff.
And yes I know you could in theory buy the student edition for cheaper or indeed use Open Office for Free.
