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
Samsung PRO Plus 512GB microSDXC UHS-I Memory Card with Adapter MB-MD512KA/AM - Best Buy
Amazon.com: [Gigastone] 512GB Micro SD Card, Gaming Plus, MicroSDXC Memory Card for Nintendo-Switch, Wyze, GoPro, Dash Cam, Security Camera, 4K Video Recording, UHS-I A1 U3 V30 C10, up to 100MB/s, with Adapter :