They would be included with the DVD inserts and is usually an encrypted code found on the "Disney Movie Rewards" insert.
There should be an insert included in most all Disney DVD releases of the past 5 years? (This includes DVD releases of past films, such as the SNOW WHITE re-release, for example.) Pixar movies, too!
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle