Costco has 10% off face value on Delta Airlines gift cards for a limited-time. Face value $500 and $1,000. No expiration date. You must sign-in as a Costco member to purchase.
Delta Gift Cards can be used toward airfare on any Delta-marketed flights worldwide at delta.com, at the airport, or by phone through Reservations. The cards can also be used on Delta Vacations packages that include air transportation.