Cd-keys For Your Items

I uh.. may or may not need a Half-Life key. Goin to a LAN next week and my spare computer (that a friend's gonna use) has CS installed on it, but I lost the cd case, so its got my key (This comp) on it. I've got east stuff, but I saw a thread for x-realm trade if ya wanna.
Btw, I'm gonna hold off a few days to make sure none of my buds have a spare key.