SanDisk 256GB Extreme microSDXC
SanDisk’s 256GB Extreme microSDXC UHS-1 Memory Card with an adapter is fully Nintendo Switch compatible, and can be picked up for $40.39 shipped, today only, originally $53.81. This high-performance microSD card handles 4K UHD video recording, Full HD video and high-resolution photos with ease, offering read speeds up to 160MB/s and writes up to 90MB/s. Product page. Read more for a video and additional information.

It’s rated A2 for faster loading and in app performance.
This card was also built for and tested in harsh conditions: temperature proof, water proof, shock proof and x-ray proof, so you won’t have to worry when in less than ideal conditions both indoors as well as outdoors. More information.