I received my coupon in august and have made 4 trips to the wal-mart to purchase my converter box only to have them tell me that they are all out. After several attempts, i finally gave my name and number so they could call me when one came available and to this day i haven't gotten a call. Therefore my coupon has expired and i need a new coupon. To just not replace these coupons is not fair. We should be able to return the unused coupons in order to receive new ones.