I can't take credit for this because I learned about it at a training the week before school. But after I heard it I thought "DUH! Why didn't I think of that?! SO SIMPLE!"
Do you have popsicle sticks with student names or numbers that you pull out of a cup? I used to put the ones I had already pulled into a little pile and inevitably at some point during the year I would lose one or two and have to replace them. Not anymore!
Take your cup and place an empty toilet paper roll inside.
Now place your popsicle sticks inside the roll.