When you need to streamline your workflow with something Trello doesn't do out of the box, use BenkoBot.
Instead of switching between systems, manage everything from your Trello board. Integrate your email, CRM or fulfillment system directly into your workflow.
The Free plan is fine for most people trying out BenkoBot, and the Standard plan is all most people ever need. Beyond that, you can upgrade or buy extra time if your usage spikes.