I use a regular library shelf. Just keep em out of light, and in plastics.
At one time I wanted to get a specific setup, where the shelf is collapsible. I see some retailers of speciality items, book stores, and libraries use these these all the time. They are not that expensive to get, and most construction companies sell them. But I can't find any.
I might have to travel far to get a setup like that, but these are sold everywhere on the planet.
The next thing to this, is a store display case, You can probably build one out of wood of your choice, and plexiglass. It just has to slide in and out from each end. It could also be a cabinent, that is all white, with the PCE logo. I forget the name of the material, but it is all white, but is cuttable, a type of plastic.