I'm confused a bit though- why do you need the XP cd?
If you get a new pc it will have Vista on it most likely.
If your Dell is having problems you might be able to request a replacement CD from them. I was able to get a repl cd from HP for only 18.00.
And when my win xp home cd was damaged I was able to get a repl one for 24.00 from Microsoft.
So if it is for the Dell contact them first and see if they can help you before buying it yourself.
I didn't know if you were looking for XP home or Professional
but did a general search search - "Microsoft Windows XP prices" -
http://www.google.com/search?hl=en&c...es&btnG=Search