Most of those designs were done specifically for the Viral/Movie.
They've been handed out at the past viral activities. At the most recent one in LA, it appeared that they had them in decks, shrink-wrapped in plastic.
I have a few from my involment with the games, but the one I'm looking for (and I imagine quite a few will be later as well) has a jester sword, on the sword is a decapitated head.
It's featured in the new trailer out this sunday (movie as well, obviously.) as the Joker says the line "Here's my card..."