Even better than last week’s DealZone, B&H has the SanDisk Extreme PRO UHS-II microSDXC 64GB with a USB 3.0 Adapter for $44.99, and the 128GB version for $89.99.
This is an great deal for a UHS-II microSDXC card with max read speed of 275 MB/s and max write speed of 100 MB/s. Note the new EOS R does take UHS-II cards (but you’ll need an adapter).