Best Buy: SanDisk 400GB microSDXC UHS-I Memory Card for Nintendo Switch SDSQXAO-400G-ANCZN
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Sandisk EXTREME PRO UHS-I 400 GB memory card MicroSDXC Class 10 - Newegg.com
Amazon.com: SanDisk 400GB Ultra microSDXC UHS-I Memory Card 100MB/s, C10, U1, Full HD Works with Nintendo Switch Neon Video Game Bundle with (1) Everything But Stromboli Memory Card Reader : Electronics