You can find a good iron kettle in Tokyo. I bought this “Tetsubin” at the Iwate goods shop in Higashi-Ginza.
It is opposite the famous Kabukiza Theater.
(Tokyo Metro Hibiya Line / Toei Asakusa Line Higashi-Ginza Station [close to Exit 3])
Perhaps this iron kettle is expensive and difficult to use. However, the hot water boiled in this iron kettle will make coffee and tea delicious. If you want to replenish iron, cool the water in a cup and drink.
And a beautiful iron kettle can be used for 100 years if you use it well.