AWS has the trusted advisor, and it will offer to assist you in cost savings in terms of:
* Idle Load Balancers
* Underutilization of EBS volumes
* Unassociated Elastic IP addresses
* Idle RDS intsances
* R53 latency resource record sets
* etc...
* Idle Load Balancers
* Underutilization of EBS volumes
* Unassociated Elastic IP addresses
* Idle RDS intsances
* R53 latency resource record sets
* etc...