Below are the approved compact flash cards that will work with the Canon EOS-1D C camera.

We also have a link below for the approximate record times. Recording in 4K will yield about 32 minutes of footage per 128 gig CF card.
http://www.texasmediasystems.com/PDFs/eos1dc-im-en-page37.pdf

When shooting 4K movies: 100 MB/sec or faster UDMA7 card
• SanDisk Extreme Pro UDMA7 128GB 100MB/s
• Lexar Professional 1000x UDMA7 32GB
• Lexar Professional 1000x UDMA7 128GB
• Lexar Professional 1000x UDMA7 64GB
• Lexar Professional 1000x UDMA7 16GB

When shooting FHD60P/50P movies: 60 MB/sec or faster card
• SanDisk Extreme Pro UDMA7 128GB 100MB/s
• Lexar Professional 1000x UDMA7 32GB
• Lexar Professional 1000x UDMA7 128GB
• Lexar Professional 1000x UDMA7 64GB
• Lexar Professional 1000x UDMA7 16GB
• Delkin Devices UDMA7 CF 1000x 128GB
• Delkin Devices UDMA7 CF 1000x 64GB
• Delkin Devices UDMA7 CF 1000x 16GB
• Transcend Compact Flash 600x 64GB
• Transcend Compact Flash 400x 64GB

http://shop.texasmediasystems.com/assets/images/products/canon/canon_1dc_a_water_lease.jpg

$11999 and in stock at Texas Media Systems (http://shop.texasmediasystems.com/Canon-EOS-1D-C-Cinema-EOS-Camera-Body--6994B002_p_5046.html)

$309 per month lease available through Canon Financial:
http://www.texasmediasystems.com/PDFs/Canon_Lease_Credit_Application.pdf