No official audiobook exists for the JR script. However, the original Broadway cast recording (available on Spotify/Apple Music) contains most of the songs used in the JR version. Your MTI production kit also includes guide vocals.
You can find the "Into the Woods Jr." play script in PDF format through various online sources, including: into the woods jr play script pdf
MTI now offers as part of their standard licensing package. However, unlike a novel you download forever, these scripts are often watermarked with your organization’s name and expire after your production license ends. You cannot legally keep a permanent copy of the full script after your final performance. No official audiobook exists for the JR script