ehhhh... Lol. Halo 3 is only for Xbox-360, that must be a big mistake! But the store will might earn much money if those who want halo 3 and don't know it's for the 360
remember that were human and we make mistakes (some more then others).
you gotta remember that some people have no clue what the difference between a PS3 and a 360 (other then they are white and black) and work at the stores