The only two ways you can watch the game are:
(a) live somewhere where Fox is airing it, which is pretty much Michigan, Louisiana, Mississippi, Alabama, most of Georgia, and the Florida panhandle (click here, and go down to the "Fox Single" map - the areas getting the Lions-Saints game are in yellow); or,
(b) get NFL Sunday Ticket - unfortunately, this isn't available on any cable service; either you have to have DirecTV, or you get it for your cellphone/tablet.
