Halo 2 for Windows

[Pyloric]

Are there any deal on this game anywhere? I can't find anything, I was wondering if anyone could help me find a deal. . .

 

[Kerig]

You can get it for 400 points on Goozex (equivalent of $20).

Currently 22 people are offering it complete, waiting for a buyer.

http://www.goozex.com/trading/asp/itemdetail.asp?item=27266&tab=T

 

[Pyloric]

I was looking for it new, but thats only because I'm not sure how games for windows works. I assume I'll have to put in a product key, so would it still be valid since it has probably been activated before? If these games are ok to buy used, I'll most likely head over to ebay. . . Thanks for any help!