CarPrices.com, one of the fastest-growing, auto-related sites on the Web, has expanded its unique New Car PriceWar(TM) service with a successful launch in the greater Los Angeles market, the company announced today. The launch of the PriceWar in Los Angeles is the first step in a national rollout into other markets this spring and summer and follows on the successful pilot test of the service with car dealers and buyers in San Diego.