Costco showing $5 off $50 max 2 Through 3/3
(Apparently normally $45, the $5 off of that is the OP deal)
https://www.costco.com/nintendo-eshop-%2450-digital-card.product.100431276.html
Sam's club has a $20x5 for $90
https://www.samsclub.com/p/nintendo-multi-character-gift-card/prod26061384
Or...