mkfotos.com
Well-known member
Lexar has 128GB SDHC cards at B&H for $229 each....if you record to both cards at once that'll give you ~12 hours of recording time + an instant backup on the second card.
...except that right now it's not possible to record to both cards simultaneously (something most if not all here would love to see); what you're describing can only be done with an external recorder.