Steam deck bricked both of my SanDisk ultra 1gb Micro sd cards when trying to format them. I am %100 most certain these are not fake.. they were working for weeks before
Prime Early Access Sale: Best Deals on SD Cards for Steam Deck and Switch - IGN
Amazon October Prime Day Deal: 512GB Nintendo Switch Memory Card for $44 (SanDisk Ultra Micro SDXC) - IGN
SanDisk 1TB Ultra microSDXC UHS-I Memory Card with SD Adapter (UP to 120 MBP/s) - SDSQUAC-1T00-GN6MA - Walmart.com