Kingston 64GB microSDXC Class 10 UHS-I 45MB/s Read Card + SD Adapter is on sale for $6.99 at Microsoft Store. Free shipping and free returns.
Description:
This blazingly fast microSDXC card is perfect for photographers who shoot action photos or high-quality HD video. You get up to 45MB/s read speed, up to 10MB/s write speed. And it comes with a full-size adapter, so you can use it in supported devices that have either microSD or full-sized SD card slots.
https://www.microsoft.c
(Amazon link here for comparison.)