From the SmarTrip website they no longer offer these discounts in Washington and all cards seem to cost $2. Cards are replaced free if they malfunction but show no signs of damage. ("If your
registered SmarTrip® card was lost, stolen, or damaged, then the remaining balance may be transferred from the old card to a new card for the cost of a new card. If it malfunctioned and showed no sign of damage, then Metro will also reimburse you for the cost of a replacement card.") See:
https://www.wmata.com/fares/smartrip/