It's no secret that I've had my fair amount of criticism towards AWS's billing and how unpredictable it becomes, even if you read every fine print and take ever

It's no secret that I've had my fair amount of criticism towards AWS's billing and how unpredictable it becomes, even if you read every fine print and take everything into account. Especially if you are a heavy user, "correction invoices" are not uncommon. That said, cloud services can be incredibly cheap if you are very careful and smart about it. Especially if you combine several of them.