Sean McLain / Wall Street Journal:Amazon quietly expands Amazon Autos to offer cars from Kia, Mazda, Subaru, Chevrolet, and Jeep, after launching with Hyundai; the service is in 130+ US cities — The e-commerce giant's new-car buying program expands to Jeep, Chevrolet and other brands — Now you can buy a brand-new Corvette on Amazon.com .