Are you tired of having to give out new punch cards every time the students reach 10 or 20 punches? These punch cards last a bit longer.
Simply print out on cardstock and write the student's names.
I start the year letting students visit the treasure box after 10 punches. The 10th punch is the circle. You could easily make it 20 punches. Or the seemingly unreachable 40 punches!
The punch cards fit in library pockets, but my students just leave them on the corner of their desk.