If you are coming from Basel by car, they also have a store in Oberengstringen (near Zurich). If you plan to buy a lot, it's much easier than near the Hauptbahnhof since you can park right outside. You must call ahead though (just google K. Lee Trading and Oberengstringen) since it is also a house. Also, it's good to call to know when they have certain items that go quickly, like Kimchi.