"Mega Extreme Fun Sale" on eShop (Lasts until Jun/16)
"Mega Extreme Fun Sale" on eShop (Lasts until Jun/16)

www.nintendo.com
Sales & Deals — My Nintendo Store - Nintendo Official Site

Nintendo games are 30% off, but there are some good discounts on other games.
It's probably easier to browse on DekuDeals.
Good price on Metroid Dread for those who haven't played it yet.