I ordered the monster unit with the physical book and you should just buy it! Probably the best $52 I have spent on therapy materials in awhile. My Tk-first graders love it and I have gotten so much use out of this product. The physical book makes it the ultimate no prep and there are so many ways to use the mini's and the book and you can structure it to practice any skill you need to hit. My kindergarten group asks for this every session, even if it is just picking a "monster pet" to sit with them during the session. Rachelle - please make a stand alone mini monster box with just monsters (and maybe their foods)! I appreciate that you can go back to the Speech Tree Instagram stories and get a closer look at the units and cannot wait for a chance to order the Zoo Unit.