Christmas blockbuster movies don't only show up in theaters. Most of America's big box-office hits are timed to be released in the summer and roll into stores on DVD and VHS cassette just in time for the Christmas shopping season.

Of course, DVDs have three advantages -- they offer a high-resolution picture, better sound quality and come with extras you can't get anywhere else: deleted scenes, director/actor commentaries, features on special effects and others.

The following is just a taste of a few family-friendly favorites offering plenty of extras that are on sale this holiday season.