Giant Eagle has a promotion online for iTunes Gift Cards. You can get a 16% discount.
Save $8 instantly when you spend $50 or more on App Store & iTunes Gift Cards! Valid 2/7/19-2/13/19.
Hopefully you;re able to purchase. I don’t think this will code as a grocery store purchase, so it probably is best to use a card that will earn at least 2%. Let me know if you have a different data point.