Price drops tend to be across the board, not by system. If it gets an official drop on the 360, the same will happen on the PS3. It isn't going to drop to $15 or whatever you could find it for later, but it'll come down. Warriors Orochi isn't a popular series!
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"When I was a young man, I had liberty, but I did not see it. I had time, but I did not know it."