With the holidays right around the corner, Amazon.com is using radio heavily as it continues to try to take shoppers away from brick-and-mortar retailers. Amazon aired 30,811 commercials on radio stations across the country last week according to Media Monitors. The Home Depot (50,287) was first, followed by GEICO (38,588) and JC Penney (33,527). McDonald’s was 5th with 25,490 spots.