With Cosmo, we had a thread before:
https://www.oesf.org/forum/index.php?topic=35844 - I got myself a case from eBay and have been generally happy with it.
Astro is slightly less wide than Cosmo, but bigger in the other dimensions (although that 1.4 mm difference in height could probably be worked around by Using the Force - leather is flexible). However, since it's also thicker, that will probably be a problem.
Astro Dimensions: 172.4 x 76.5 x 18.7mm
Cosmo Dimensions 171 x 79.3 x 17.3mm
So...any ideas on where to get a suitable belt case for this (that would allow horizontal placement?).
No, I still do not have the device. It's been at "contribution locked" since August and Planet has been giving pretty much useless or no updates at all, but I'm trying to remain positive that I'll get the darn thing soon, so starting to look into this as well.