SanDisk 400GB microSDXC UHS-I Memory Card for Nintendo Switch SDSQXAO-400G-ANCZN - Best Buy
Deal Alert: Get a 400GB Micro SDXC Card for Your Nintendo Switch for $28.99 (512GB for $39.99) - IGN
Amazon.com: SanDisk Ultra 400GB SDXC Micro Class 10 Works with RED Hydrogen One UHS-I Class 10 Bundle with Everything But Stromboli Card Reader : Electronics
SanDisk 400GB ImageMate microSDXC UHS I Memory Card with Adapter SDSQUA4-400G-Aw6ka - Walmart.com