Today’s B&H DealZone (one-day deal) features the SanDisk Extreme PRO UHS-II microSDXC with a USB 3.0 Adapter, at a 50% savings. Both 128GB and 64GB capacities are available.
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). This deal is today only or until sold out.