Costco is selling discounted iTunes gift cards. You can get:

• $200 iTunes gift cards for $164.99
• $100 iTunes gift cards for $84.49
• $25 iTunes gift cards for $21.49

There’s a limit of 2 per member for each card.

You need a membership in order to get discount. In-store you can only use Visa cards, but online you can also use Mastercard or Discover. You should probably go with your Discover it card for an extra 5% cashback at wholesale clubs this quarter.