The cheapest way to catch NFL RedZone is through a subscription to NFL+ Premium. At 15 USD per month, it offers NFL RedZone alongside NFL Network programming and on-demand replays of past games. However, this service is primarily for mobile and tablet devices. For watching on a TV, Sling TV with the Sports Extra add-on might be the most affordable option, though the total cost depends on the chosen Sling TV base plan. Please keep in mind Sling does not offer free trials.