B&H Photo Video has a 2-Pack of Lexar 64GB Professional 1000x UHS-II SDXC + a free Lexar card reader for $68.95.
This is a high-speed UHS-II card rated at UHS speed class 3, 150 MB/s, which is good enough for 4K video. Canon cameras today don’t support UHS-II, but this card is backwards compatible to UHS-I and future-proof in case some day they do.
Last time this card was on sale, a single 64GB card was $35, this is a great deal for two cards + a USB 3.0 reader ($20 value).