SanDisk 32/64/128gb CF Ultra Extreme Pro Compact Flash Memory Card 4 Camera UK | eBay
Amazon.com: SanDisk Extreme 64GB CompactFlash CF Memory Card (2 Pack) Works with Canon EOS 5D Mark IV Digital DSLR Cameras HD UDMA 7 (SDCFXSB-064G-G46) Bundle with Everything But Stromboli Combo Reader :
SanDisk Extreme Pro 160MB/s 256GB CompactFlash Card Review and Speed Test - Camera Memory Speed Comparison & Performance tests for SD and CF cards