SanDisk crams 400GB into a microSD card | Engadget
Amazon Basic Micro SD 512 GB. I have just bought it for my Steam Deck because Sandisk cards prices rose and this card was on offer. It has solid writing speed in
Amazon.com: SanDisk Ultra 256GB MicroSD XC Class 10 A1 UHS-1 Mobile Memory Card up to 100MB/s Read Speed (SDSQUAR-256G-GN6MN) with Mini MemoryMarket MicroSD Memory Card Reader : Electronics
Amazon.com: Team 256GB Color microSDXC CL10 UHS-I Memory Card w/SD Adapter : Electronics