No, I just used the VM price, as I expected the disks to be small and cheap (same thing for network, etc). Indeed, premium disks are more expensive, which is logical, but for a small disk that shouldn't make a huge difference according to azure.microsoft.com/is-is/pricing/...
When the VM is not in use, I guess you are always charged, even for standard disks, as long as you use them. You could create a snapshot to save them, but personally I just recreate everything - it's just temporary stuff for the day, I have a script that sets up everything, and at the end of the day I commit everything and kill the whole thing (in fact I delete the resource group).
Serverless developer machine xD
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