Went to purchase converter boxs on the due date, 10 - 03 and the cards were denied. Recipt printed out from register stating Card Issuer Denied. Cashier had already scanned and bagged my items when the cards were swiped, time was 15 til midnight. The final time and date on my recipt from Wal-Mart was10-03-08, 11:56 pm. Even after a manager tried the cards, voided original sell and rescanned 2 items which were not the converter boxes(2).