SanDisk just released the most impressive microSD card | Mashable
Amazon.com: SanDisk Ultra 400GB MicroSD XC Class 10 A1 UHS-1 Mobile Memory Card up to 100MB/s Read Speed (SDSQUAR-400G-GN6MN) with Mini MemoryMarket MicroSD Memory Card Reader : Electronics
Micro SD Card 400GB High Speed Class 10 Micro SD SDXC Card with Adapter