First, you will want to find the product that you are interested in. Once you find the product and/or service that you want, you will want to do some shopping comparison research to ensure that you are able to find the right retailer to purchase it from. Once this is complete, your task will be to see how much the promo code, coupon, or another sort of discount that you found will decrease the price. Then, you should make a comparison with the other available purchase options.