I want to buy a new teapot.
You might consider a teapot by Inge Nielsen instead. This is definitely preferable to a cheap Yixing teapot of dubious construction or a cast iron “teapot”. Her teapots pour rapidly, are exceptionally functional, are neutral, and do not risk poisoning you in the long term like a cheap “zisha” pot might.
https://ingenielsenpottery.com/