Not a huge savings or amazing deal but if you are buying a Delta ticket anyway maybe your time for a few clicks is worth saving $15 off a ticket.
That is, if they are not sold out yet you can then use THIS LINK to CardCash and buy Delta e-Gift cards and save 10% on each. [EDIT: you can also get 1% cash back via Coupon Cactus starting here then searching for CardCash and then Delta Air Lines for the gift cards] I am only showing you three in this shot because:
You can use a maximum of three e-Gift cards plus a credit card to pay for a Delta ticket. If you have two people flying you would have to book separately to use three more of these e-Gift cards. But then keep in mind you will be on separate reservations, or PNRs, and may not get all the same perks as all on one reservation (but you can LINK them).
Also understand you can NOT combine these e-Gift cards with bump type vouchers. Bump vouchers are “officially” limited to one per reservation / ticket.
The only thing I am not sure about is if these e-cards will become instantly available. CardCash says you will get them within 2 hours but if you just go buy a normal Delta e-Gift card on Delta.com it takes up to 72 hours for those e-Gift cards to become spendable. Just know this might happen here too as I have not tested buying these. – René