Is it possible to buy a new copy of Halo CE for PC? I want to play multiplayer with it, but I hear you need a CD key that hasn't been used before, so I doubt used will be any good.
I've looked at Amazon, Play.com and eBay. New is like £30, which is ridiculous.
Edit: Or, am I wrong and can you use a used copy of the game with a CD key already been used before?
[Edited on 01.16.2012 12:09 PM PST]