Agility ladders are simple tools you can use to improve your footwork and prepare for soccer and other sports that require jumping and sprinting. The Vye Fitness 10-Rung Agility Ladder is designed to hold up against dirt, grass, and cleats. It has a compact design and rolls up into a back when you are done.
You can get one of these for under $20 at this time. More info is available here.