Where can I find a movie version of "The Good Earth"?
A movie version starring Paul Muni and Luise Rainer came out in 1937. You can find information about it at the web sites linked below, especially at the eNotes Videohound Movie Retriever site. You can watch a trailer for the movie at the youtube link.
I'm sure you can rent the DVD at Blockbuster or Hollywood Video or any other video store. You may even be able to find a copy at your local public library. If all else fails, purchase a copy at amazon.com.