YOU CAN'T PUT A PRICE ON LOVE -- When a luxury car salesman is found bludgeoned to death in Harlem, Detectives Briscoe (Jerry Orbach) and Green (Jesse L. Martin) search for his last customer and trace their suspect through his recent spree of robberies. However, when their alleged murderer turns out to be developmentally disabled, A.D.A.s Jack McCoy (Sam Waterston) and Serena Southerlyn (Elisabeth Rohm) turn their suspicions to the man's extremely attractive and equally manipulative girlfriend (guest star Vanessa Ferlito, "25th Hour").