Seussical the Musical

Hi there, I am a primary teacher who is thinkig of doing 'Seussical the Musical' for our end of year school production. I am wondering where do you get your hands on a script????? We are a small school with only 26 students in total, is this too much for us? I could adapt the musical slightly but I don't know where to start to look for a script. And is there any tips for the musical, from anyone that has done it already? Thanks, Christie