Copy raffle tickets on a color of your choice and cut apart with a paper cutter.
I usually run 5 sheets for a total of 50 raffle tickets. I pass them out for any behavior
I wish to encourage. When I run out of tickets, I draw a name (or names) for a prize.
Raffle tickets are a great motivator and very easy to use. I carry them around in my pocket and pass them out as I teach.