The Cost Dashboard provides insights into the costs of traffic across zones and egress traffic out to the internet.
This is an example of the Cost Dashboard.
Prices for the network traffic are computed using $0.02 per GB for cross zone traffic and $0.09GB for egress traffic to the internet.
You can toggle between viewing the cost, traffic or both using the View selector in the upper right.
It is possible to get details for any given service by expanding out the view. This provides a drill down like the following:
This detailed view provides cost per flow for the given service. Furthermore you can click on the icon to be taken to graph of the data showing both the cross zone and egress traffic for a given service.