I usually get some from the local Asian food market, from the butcher or at the grocery store and cut it down myself. Some grocery stores will cut it for you as well, but if you need to pick up some meat and cut it yourself it isn’t hard if you’re careful. The nice thing is that it’ll work with with basically anything
My country sucks. It also severely lacks an Asian population to have an Asian store, that sells Asian goods. The last part is probably more important than the first point, but both relevant all the same.