Setup a cost budget in your AWS account based on your needs.
- Go to "Billing"
- Click on "Budgets" in the menu
- Click on "Create a budget"
- Choose "Cost Budget" and click on "Next"
- Choose the values that work for you. For example, recurring monthly budget with a specific amount
- Insert a budget name and Click on "Next"
- Set up an alert but clicking on "Add an alert threshold"
- Set a threshold (e.g. 75% of budgeted amount)
- Set an email where a notification will be sent
- Click on "Next" until you can click on "Create a budget"