I couldn't justify spending the €40 plus shipping from Germany that Zomo is asking on their website so I hunted all over for a case that would work.
I found https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

The fit is damn near perfect. Check it out:

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I plan to cut and fit a couple of foam pieces to fill the gap on the sides.
I'm not affiliated in any way with the seller and I'm not making any money off of this or anything, just thought some others might want a nice travel case for the Zomo at a great price :-)