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You can only get cablecards from your local provider. Since you live in Columbia I'm guessing you have either Comcast or Verizon FIOS. Verizon charges $2.95 per month for each cablecard. You'd have to contact Comcast for their price. Cablecard pricing varies widely all over the country as there doesn't seem to be any standard price structure and providers are pretty much free to charge what they want for them. There's one horror story posted where someone is getting charged about $30 per month for two cablecards by their provider.