This is our favorite page finder. We love it's durability and small footprint. It doesn't take up a ton of visual space in your planner, so you can still see all of your week/month.
We like using two of them, one in our monthly section and one in the weekly section.
This page finder will fit discbound planners from junior size and up. It will not fit mini size.
This plastic page finder has 8 punches and a ruler which comes in handy!