I've been looking also but haven't found quite what I'll settle with and price. These people said they have worked with the Smart Controller and have several options.
If you need custom foam, you need MyCaseBuilder. Design your own custom foam case with our easy-to-use web application.
mycasebuilder.com
The Doro D1510-6 case is a great option for a heavy-duty case to fit this item - cost $145.03 for case and custom foam.
The V200 Vault by Pelican case is a good option as well - cost $127.29 for case and custom foam.
The J192 case will fit - cost $117.37 for case and custom foam.
The PW6 case will fit, but the controller will sit proud above the base foam - cost $95.10 for case and custom foam.
I'm using a Canon T5 Canvas camera bag and a canvas bag that came with one of my Chevy Blazers. Here's what the Blazer bag loos like. I put a foam liner in it and use a cloth bag around it and hook a lanyard to it. We all know what a Canon bag look like but it is a good sturdy protective fit to meet temporary needs.