TBH, what I really want is sleeve like the Octovo sleeve I got for my Kindle DX.
I think I'm going to give this one a try:
https://www.amazon.com/Aubaddy-Doubl...dp/B01BN5AOCO/
It's "branded" for iPad Mini but the Aura is pretty close to the same size (~5mm shorter, ~4mm wider, ~1.5mm thinner) so it should fit pretty well.