SSL-based communications are now becoming the de facto standard—insecure methods are no longer good enough.
AWS provides the AWS Certificate Manager (ACM) service to provision AWS-backed SSL certificates that you can use with your AWS resources, such as Elastic Load Balancers (ELBs) and CloudFront.
ACM is free to use! There's nothing to pay for the certificates themselves. You pay for the underlying resources you use with them as normal.