TORONTO – After securing carriage on Shaw Cable, Star Choice and Cogeco Cable, Teletoon Retro, a digital channel launched less than two months ago, already has over 4 million subscribers. That’s within anvil-tossing distance of some analog stations, like BNN, which has just over five million, for example. The rapid build-up can likely be traced to the channel’s decision, as we reported here, to request digital basic carriage in exchange for very low wholesale rates (free for a year, six cents the following year and five cents for the next three years). So for the BDUs that carry the specialty...