Policies: The majority of stores do not purposefully allow overage, and this is often stated in their coupon policy (examples include CVS, Rite Aid, Safeway, Target, and Walgreens). Many cashiers adjust the amount of the coupon down to match the price of the product if the coupon's face value is greater. However, some registers may accept the full value of the coupon and apply the remainder to the rest of your purchase cost. Exceptions to overage allowance are Albertsons and Walmart. Below are excerpts from their coupon policies:
Albertsons: "Coupons that exceed the retail value of an item will have the remaining amount applied to the balance of the transaction. In the event a transaction balance results in a "credit," additional items WILL be added/suggested to the order to utilize the remaining value of the coupon. We will not provide any "cash back" on coupons; however we will provide full redemption value."
Walmart: "If coupon value exceeds the price of the item, the excess may be given to the customer as cash or applied toward the basket purchase."
Additional Options: Other stores most likely to give overage include local, non-chain stores or those with registers/cashiers that do not adjust down the coupon price. Shop around (trial and error) or ask customer service to see if any stores in your area offer overage. If they do, remember that this is a privilege, and the store may reverse their policy or update their register system at any time.