This unit is only $10. It includes 6 how to videos, and handouts. Share with your students and watch them have fun while you walk around the room enjoying their progress. This is by far one of my favorite units and I am so excited that it hasn't lost momentum since I started using it since 2005. I have made revisions to the unit and if I do make changes, they will be in the folder in Google Drive that you will have access to.