Whichever grocery and/or drug store that you shop at has their coupon policies online or you can ask the store manager. It’s important to know this information because as you prepare your shopping list, you will have to be aware of how many coupons you are using and what the total cost will be. For example, many stores limit 20 coupons per transaction. Also, some stores do not allow you to use more than two of the same coupons for a product.