I've been runaround all day today trying to get an M-Card for my Ceton Infinitv 4, and the only answer I can get out of Cox is "Sorry we only have S-Cards".
That is absolutely crazy. I know they have M-Cards because that is what's in the DVR's that they are more than willing to let you rent.
I finally opened a support ticket with Ceton to see if they can help.
The thing that really gets me is that on the Newegg page where I bought my Infinitv card there was someone from Tulsa that posted three days ago about how great it all works. How did they get an M-card?