Amazon.com: SanDisk Micro SDXC Ultra Class 10 UHS-1 512GB Memory Card Works with Nintendo Switch OLED Model Gaming System (SDSQUA4-512G-GN6MN) Bundle with (1) Everything But Stromboli SD & MicroSD Card Reader :
Nintendo Support: How to Insert/Remove microSD Cards
Choosing a microSD Card for Your Nintendo Switch - Kingston Technology
Best SD cards for Switch - store more games | TechRadar
Nintendo Switch™Micro SD Memory Card, MicroSDX (62 GB - 512 GB) | Western Digital
SD GUNDAM BATTLE ALLIANCE for Nintendo Switch - Nintendo Official Site