Amazon.com: SanDisk - 400GB microSDXC UHS-I for Nintendo Switch : Video Games
SanDisk Extreme PRO 4K Ultra HD 400G 400GB 100MB/s Class10 C10 UHS-I U3 V30 A2 MicroSDXC With Adapter for smartphone action cameras drones - Newegg.com
Original Sandisk Micro Sd Card 400gb 256gb 128gb Microsdxc Uhs-i U3 4k Hd Red Blue Yellow Memory Tf Card For Nintendo Switch - Memory Cards - AliExpress
Sandisk Extreme 400gb Micro SD on clearance at US Costco for $24.97. YMMV : r/retroid
SanDisk 400GB Ultra microSDXC UHS-I Memory SD Card 100MB/s C10 U1 A1 Full HD 619659161552 | eBay
SanDisk 400 GB Nintendo Switch micro SD XC Card Class10 Flash Storage Memory USA | eBay
SanDisk just released the most impressive microSD card | Mashable
Amazon.com: SanDisk 400GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-400G-GN6MA : Electronics