There are two Etsy Stores that I love and they have really great prices (less than $2.00) :)
Kittik Printables made the fall themed stickers and The Gifted Pepper made my Steps and Workout stickers.
I always plan my workouts for the week ahead. I try and get about 15 miles of running (with some walking) in a week. I use the stickers to record actual steps/work-outs.
I use the zipper pouch in the back of my planner to store extra stickers :)