I've considered purchasing and installing a customer owned cablecard but I'm afraid it won't work and would be a waste of money. I know Ebay has both Motorola and Cisco cablecards for sale as of last night. If anyone wants to give me $20 bucks I'll be happy to find out.
The big problem with buying a CableCARD or older non CableCARD box is it doesn't include the private keys the provider needs to input into their system.