I couldn't find any info about how or it is possible to get the monthly price for each VM Instance separately on Google Cloud Compute Engine.
Thank you!
Right know you can retrieve only billing information about the cost of the VM per machine type and region, but not for a specific VM.
What you are looking for is under developement at the moment and you can star the corresponding feature request to get notifications.
1- Select or create a Cloud Platform project. https://console.cloud.google.com/cloud-resource-manager?_ga=2.37436901.-491760448.1509366892?
2- Enable billing for your project. https://support.google.com/cloud/answer/6293499#enable-billing?