If you have access to a good arts and crafts store, you can make a stropping setup for a lot less than trying to get it sent to you.
What you need will be in four parts: a base, some adhesive-backed magnetic sheets, some balsa strips and stropping compound.
The first item is a base. Chef Knives To Go sells a 3 inch by 11 inch (75 mm x 280 mm) coated steel stropping base for $19.99, but you can make your own. The primary issue is to decide how long and how wide you want it to be. This will mostly be determined by the available sizes of adhesive-backed magnetic sheeting. And that will mostly be determined by your local paper size.
Since you are asking about something in Norway, I am supposing that you use A4 paper as your primary paper measurement system. Since a sheet of A4 paper is 210 mm x 297 mm, then you will probably want to make a base about 75 mm wide by 300 mm long. Find a piece of steel plate about that size which is thick enough not to flex and which will accept a magnet being attached to it (stainless steel may be problematic, so it may need to be carbon steel). Be sure you can coat it so that it will resist having its surface get rusted, but it will still accept a magnet. Then put something on the bottom to keep it from sliding around. Now, you have a base.
Next, get some adhesive-backed flexible magnetic sheeting. The thicker the sheeting, the better. I would suggest you do not get sheeting which has a magnetic base less than 30 mil thick. Since this is for Norway, it will most likely come in A4 paper size. Cut the sheet(s) you get into strips 70 mm x 297 mm. If your magnetic sheeting comes in a different size, then just adjust everything accordingly.
One trick to get exactly 1/3rd is to take a ruler (say, at least 300 mm long) with markings every 10 mm on the ruler, and lay it across the sheet so that two marks on the ruler 240 mm apart are on the edges of the sheet. Then mark the sheet where the ruler is 80 mm and 160 mm are along the ruler. Do this several times, both progressing along the length of the sheet parallel to your first set of marks and by turning the ruler to measure at a different angle, to mark a separate set of marks. Then, use the ruler to mark a pair of lines parallel to the long length of the sheet and cut the sheet along those lines.
You now have your magnetic backing.
Now, buy some strips of balsa. I don't know what's available in Norway, but most likely you can get something 75 mm wide by 1 meter long by whatever thickness is otherwise available. Just make sure the thickness is enough to be somewhat resistant to easy breakage.
Now, you can make your strops. Just cut the balsa so that it is just the exact length of the steel base. Then carefully align and place a magnetic sheet strip along the balsa. And that's it. Make as many magnetic balsa strops as you want.
You can also make your own leather strops as well. Cowhide is the most common, but horsehide is smoother and kangaroo is the smoothest. Be sure when you are buying the hides that the particular curing leaves the hide stiff and without hair.
In use, the strops will directly attach by the magnetic backing to the base and can be removed by just sliding them off.
Then, acquire some stropping compounds. Slurries may work best. Use one balsa strop per compound. I would also suggest keeping at least one strop completely bare of any compound.
In use, after you have finished using one of the loaded strops, wash and dry your knife or knives before you take them to a finer compound or to a bare (unloaded) strop.
Hope that helps.
Galley Swiller