Mist.io lists the monthly cost of a machine on the Machine page. You can sort your machines based on most or least expensive. You can also see where the machine is hosted, the create date, and the state of the machine.
Also, you can select a machine to get more detailed information such as Cost Per Hour, Cost Per Month, and the Create data.
If you have infrastructure and accounts across many clouds this is a great way to view all the related costs in a unified dashboard.