Electronic retail chain Best Buy is holding a special deal for eShop cards when you pre-order a copy of Pokémon Sun or Moon. All you need to do is select whether you’ll get Sun or Moon, then, choose the eShop credit amount you want where it’ll then apply the 15% for the card.
If you are looking for a quick chance to get a eShop card on sale, this is the time to act since they typically never go on sale compared to physical media of games. Thanks CAG for the heads up.