Price items for VPC peering inter-region

Yes - the customers will be charged only for data transfer out. From in the docs: "Data transferred across Inter-Region VPC Peering connections is charged at the standard inter-region data transfer rates." [https://aws.amazon.com/about-aws/whats-new/2017/11/announcing-support-for-inter-region-vpc-peering/]

Also, Inter-region VPC peering is now available globally: https://aws.amazon.com/about-aws/whats-new/2018/02/inter-region-vpc-peering-is-now-available-in-nine-additional-aws-regions/