DIY Pomera 250 Case
The case options for the Pomera 250s (DM25US here) seem limited, or at the very least hard to size.
I found an old socket case with a blue hammerite paint job marked down to 1.99 , and then was cut another 25%. I cut down a few sheets of thicker EVA foam and by pressing the case into the foam I got the dimensions for cutting. It's a serviceable case. It isn't ideal, is both a little heavy and flimsy at the same time, but it works and was inexpensive.
The only improvements I plan to make is I might use some neoprene wetsuit material scraps at the local "art and creative reuse store" or sorbathane or something equlivlent. I might also add some cloth on top of the padding to make it more attractive.
The zip "hard" case for a Logitech k380 or similar keyboard or slip cases can be reasonable in price, but I do like the look and feeling of it, plus it doesn't slide around at all.