In these days of thin or nonexistent school budgets for classroom supplies, it's important to economize wherever we can. Here is a way for teachers to make their own functional math journals with regular supplies from their classroom, or if they are using their own money, to do it less expensively.
Teachers know that math journals are important for students to explore their thinking and activate their metacognition. When I have used them in my classes, students have written everything from "I love math" to the latest times table they have learned. Many resources on the web exist about how to make the best use of these journals. One such link can be found at http://math.about.com/library/weekly/aa123001a.htm
Writing about math will make students more aware of their thinking processes and better at problem solving or identifying where they are stuck. They can provide valuable insight for the teachers who want to help them.