For drugstores, you can go to Eckerd's, Long drugs, Rite Aid and Walgreens among others.
While you will receive complete face associated with your card - usually 60 to 92% - you will get cash you didn't have before and the card is actually re-sold to someone that may use it. https://Enrouteinstitute.com/forums/topic/find-out-more-about-e-gift-cards/