In a league governed by a salary cap, finding productive players on low-cost rookie deals or bargained-based veterans can be the key to success in the NFL.The teams taking the field for the playoffs this month all have plenty good deals to help along the way whether it’s a star quarterback on a rookie deal like Buffalo’s Josh Allen, a fourth-round rookie cornerback like Kansas City’s L’Jarius Sneed or a veteran cornerback like Xavier Rhodes, who signed a one-year, $3.5 million deal with the Colts.Getting contributions at relatively low costs allows teams to spend big bucks for stars and helps build a playoff-caliber roster.Many of the teams back home watching have some deals they regret that contributed to their struggles.Here’s a look at.