Los Angeles-based Mota Motors, which provides services to help consumers buy and sell used automobiles, is one of the Southern California startups which is making a push at TechCrunch50 this week. Mota launched a new site at the conference Monday. Mota is venture backed by Prism VentureWorks, and received $4.5M in funding back in April of 2008. The company is headed by Reza Bundy.