I guess there aren't that many global network providers - I'm not even sure how much fiber Amazon owns in Japan, Australia or Northern Europe for that matter.
And while they have a call-us price list (if you have to ask...) - they at least state:
"Public and Private high-capacity networking options up to 10Gbps. Note: there is no charge for internal data center traffic.
Cost on a per-GB-out model"
I have no idea what they charge pr gb for this cloud product however.
For egress bandwidth costs, I'd assume it included, well, the egress bandwidth cost.