In terms of NFL starting quarterbacks, Dak Prescott is the greatest bargain in the league. With salaries for the most crucial position in the game soaring, he is playing for the Dallas Cowboys on a fourth-round rookie deal that is the equivalent of pocket change. While there have been other late-round success stories like Tom Brady, and the Cowboys had UDFA Tony Romo become their starter, Prescott may be unique in that he has been the starter from the first game of his career despite being such a late pick.