it wasn't a mistake -- but it was a one shot, one day deal, for the 9th of September.

I expect it's probably because the 7th season of Smallville came out on the 9th, so they might have had other Superman things on sale as well.

wink

Superman: Why is it that good villains never die?
Batman: Clark, what the hell are good villains?
=> Superman/Batman: Public Enemies