In the search for cheap and slightly thinner panel wood for a shelving project, may I recommend
Spirec in Borås. They purchase leftover lots of wood and other materials from larger constructions and sawmills. It can also be material with partial blemishes like mold and water damage.
Nevertheless, ridiculously cheap. They also have an excellent range of rough-sawn materials. I found planed decking wood that hasn't been treated. Useful if you want to paint homemade outdoor furniture with modern colors. And of course, I found 17x95 fine-sawn spruce for my shelves for 7:-/m.
I chatted a bit with one of the owners who informed me they will be opening a branch in the Malmö area soon. Eagerly waiting for Gothenburg to be next. Recycling building materials is very timely.