From Sweden, so your grandmother must bake krumkake and you cosplay as ABBA
There should be an art store in Sweden that would have craft foam. A few sources for cheap foam of random sorts. From electronic stores or friends who have just bought electronics you can get the foam blocks that are packed in the box, but it's usually Styrene foam that is crumbly. Find a shop near you that deals in large finely milled machine parts, the huge gears and parts some times come packed in foam that’s made from urethane, it has a finer texture than the cheap foam used in stereo or VCR packing. Or you could get some of the Urethane foam insulation from a hardware store or gets scraps from some one working on a house
Now I have to go look for my krumkake iron and see if I can get as far as frying them before I eat all the batter. Grandma never let me eat the batter she would hit me with a large wooden spoon