It would appear to be either missing or busted all to hell, as I can't find it for love nor money. Xbox.com shows the PC version, but there's no sign of the 360 version anywhere. Anyone have any idea what's going on here? As an unashamed SF fanboy and a completionist, the knowledge that I don't have these is somewhat infuriating.
EDIT: because these names are confusing as all hell, this is the Evil Ryu/Oni/Yun/Yang costume pack.