You will probably have trouble finding that because Doom 3 and the expansion pack have been around for a while now. The big box stores (Best Buy, Wal-Mart, Circuit City) most likely won't have it anymore because its been around for a while now.

Gamestop, EB Games are your best bet, and even then its doubtful again due to the game's age. Buying online, or buying the expansion pack version for the XBox (where the full version is not required) is probably how you will get this.

 

Yea i tried everywhere and couldnt find it. So i just ordered it. Be here on Weds. Anyone else play Doom 3 online???