It's the time of year both parents and students approach with a mix of excitement and dread: back-to-school prep. If you're lucky, you already have a list from your school with the supplies that will be required for the coming year. But the choices can still be daunting when you go on your shopping trip. Whether you feel like you have everything under control, or you're running out on the last weekend before school starts, these tips will help keep more money in your pocket.