One of the risks with giving developers their own sandboxes is that they’ll forget to shut down EC2 instances, or RDS databases, or any of the other AWS services that come with a per-hour charge. It happens. I’ve done it, as have most of the developers I know. But there’s no reason to be surprised when the bill arrives. In this post I’ll give an introduction to Budgets, and walk through using Cost Explorer to find a forgotten Sagemaker notebook.