I got myself a Desiccant Cabinet, also known as a Dehumidifier Cabinet, Desiccator, Humidity Chamber, Constant Humidity Storage Chamber, Environmental Chamber, Dry Cabinet or Dry Box.
A fairly simple device but hard to find here. I don’t know if it’s because there aren’t that much retailers here, or simply because people don’t know what to call it. When you’ve got descriptors like the above mentioned, you can’t blame the regular hardware store people to know what you’re talking about.
I finally found them in Handyman Galleria. There were 3 sizes in stock: one small-ish, 2-level cabinet for 4K+, a “medium-sized,” 3-level model for 8.4k+ and one large version 5 levels I think, about as tall as a chair (you literally had to set it on the floor) for 13k+.
I got the middle one. And I was lucky, they marked up the price already, but I was sold the model with the “pre-markup” price (about 7k+).