In my daughter's class (3rd grade) the teacher gives them play money at the beginning of each week. If they misbehave, they have to pay the teacher. If they go out of their way and do something great, she gives them additional money. The kids can save up money for treats - the teacher has a treasure chest full of dollar-store items they can "buy," or the kids can also use their money for certain privileges such as being the teacher's helper for a day, or taking an extra trip to the library (I know that doesn't sound all that exciting, but apparently they all really save their money for these privileges!). In a home setting, they could save up and earn privileges such as choosing the snack for the day, or going to the park, or... who knows. Think of a few things that kids like and that would motivate them to behave well! Trips to the library, or the pool, or making popsicles...