Here is a free script from my Wizard of Oz Reader's Theater Pack (10 Scripts!)
"How Dorothy Saved the Scarecrow" tells the tale of Dorothy meeting the Scarecrow and inviting him to join her journey to Oz. Your students will love this script based on the book The Wonderful Wizard of Oz by L. Frank Baum.
The 4 page script includes the following parts: Dorothy, Scarecrow, Readers 1-4
I recommend this script for third grade and up. The style and language is true to the original book with very few changes, so younger students may find it challenging.