I can get you one for under 100.00 or barely over brand new!
It is on ebay I plan to buy a copy of xp pro soon myself. I would suggest you register there and buy one that ships world wide.
Here is a link to one on ebay now.http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...7129390782&rd=1
If you can find one that ships world wide your doing good. Otherwise go to ebay homepage using that link and go down to the bottom and find the ebay in your country.
The register on your countries ebay and buy one.
Hope this helps you some. Ebay is the cheapest place to get the OS that I know of.