Amazon Basics MicroSDXC Memory Card with Full Size Adapter, A2, U3, Read Speed up to 100 MB/s, 1TB, Black

Its of devices like steam deck or steam frame max out at 100mbs so whilst this is not the fastest a2 card you can get it. It is the fastest you can get for a device like the steam deck. Price is lowest it has been for a while 1tb a2 sdcards are pushing £200 at the moment. Yes a year ago this would have cost you a mere £70 but you wont find any new a2 cards in this price bracket and if it fails it is amazon so an easy return.