One of the great things about cooking at home is the leftovers, and it's a sure bet for saving money. Let's say the ingredients of your home-cooked dinner costs $20. If you're able to eat your leftovers for lunch for a couple days after, go ahead and divide that cost by three and you'll have an idea of just how much money you can save. Plus, when the ingredients hang out together in the fridge, it only enhances the flavors. Casseroles and crock pot meals are great because they can feed your family for more than one night. Lasagna is another great meal for delicious leftovers.