The Dodgers have reached a preliminary agreement on a three-year contract extension with right-hander Chad Billingsley, according to a source. The deal includes an option for a fourth year and is worth approximately $35 million. The contract would lock up Billingsley for two years after he would be eligible for free agency. He is earning $6.275 million this year. "This is the organization I came up with and the one I'd like to be with," Billingsley said Monday.