Azure burstable VMs eg Standard B2s (2 vcpus, 4GB memory) are cost efficient at £26.12 per month.

To monitor the CPU credits remaining:

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There is also an alert you can setup to email if it falls below a certain threshold - see blog below.

I’ve also found the disk iOPs are fairly limited on the burstable I’m using here. But generally it is totally fine and a great choice.