If you are eligible for the Free Usage Tier, you can now transfer up to 50 Gigabytes of data and up to 2,000,000 requests per month at no charge. The free tier can be used for anything you want to run in the Cloud: launch new applications, test existing applications in the Cloud, or simply gain hands-on experience with AWS.
Read more here – http://aws.amazon.com/about-aws/whats-new/2014/05/08/aws-free-usage-tier-now-includes-amazon-cloudfront/