Available from Enterplay.
G.I. Joe Trading Card Fun Packs (6)
I ordered a few sets and they arrived today.
I was able to put together one complete set and almost a second.
the cards are pretty nice, and the info on the back of the cards matches the movie for the most part. one card used the word reeks instead of wreaks and the prison was a different name than in the final film. Einsargen was in the film Deggendorf is on the cards.
Generals Joes did a review here:
G.I. Joe: Retaliation trading cards are a nice old school surprise | Generals Joes - A blog about the importance (or unimportance) of little plastic men