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: Made for Amazon SanDisk 128GB microSD Memory Card for Fire Tablets and Fire -TV : Electronics
Amazon.com: Micro Center 64GB Class 10 MicroSDXC Flash Memory Card with Adapter for Mobile Device Storage Phone, Tablet, Drone & Full HD Video Recording - 80MB/s UHS-I, C10, U1 (2 Pack) :
Amazon.com: 32GB microSD Memory Card | Micro SD Class 10 Compatible with Amazon Kindle Fire 7, Kids Edition, Fire HD 8 / HD8, Fire HD 10 / HDX 7, HDX 8.9. Fits All 7 or 8.9 inches Tablet PC | 32 GB : Electronics