How to set up AWS Trusted Advisor alert for Service Limit warnings?
That's on my backlog but still on early stage, I just surfaced the idea, so here's are my findings so far:

Using Trusted Advisor as a Web Service

Mainly: 
Poll a Trusted Advisor Check for Status Changes

This documentation example can be implemented with aws cli with the support subset of commands and targetting the 'us-east-1' region, you'll then have to filter on the region field in the TrustedAdvisorResourceDetail structure part of the list.

I still didn't had time to write a script to poll the API (I would aim at ruby with the AWS SDK per our usage more than a shell script to group the requests).

Hope this help getting started even if that's not really a complete answer.

Courtesy of Romeo Ninov: For a  recap of which options is available for which account type you can check this site