Professional 64GB, UHS-II, V90, U3 280MB/s SDXC Memory Card - MANPROSD64 | Manfrotto US
Best Buy: SanDisk Extreme PRO 64GB SDXC UHS-I Memory Card SDSDXXY-064G-ANCIN
Sandisk Ultra Lite Micro SDXC 64GB Memory Card Black | Techinn
Amazon.com: SanDisk SDSDQUA-064G-A11 Professional Ultra 64GB MicroSDXC card is custom formatted for high speed, lossless recording! Includes Standard SD Adapter. (UHS-1 Class 10 Certified 30MB/sec) for GoPro HERO4 Black : Electronics