Samsung EVO Select 256GB microSD card is available on Amazon starting May 2017. Initially the microSD card is available at a cost of $150. Now Samsung EVO Select 256GB microSD card is discounted $50 and available at a cost of $99.99.
It heaves 100MB/s read speeds, 90MB/s write speeds, Class 10 UHS-3 certification, and a 10-year limited warranty. Amazon Ships the microSD free usually.