These are the Star Bucks that I created for behavior management. These are earned for various things such as great grades, extra effort, awesome behavior etc. They can also be lost for having poor behavior, no homework, not participating. I will print each denomination on its own color of paper. For example: $1 on green, $5 on yellow. (My school's colors.)
I have it so that they have plenty of potential to be earned, and many of the prizes are things that I do not have to buy. Such as lunch with me, swap seats with a partner, or pick their own class job.
I will take them to Kinko's to run the copies so that I have a large supply. As the year progresses, the cost of certain things will go up or down