https://blog.wongcw.com/2019/03/12/%e4%b8%8d%e5%be%97%e5%9c%a8%e5%85%b6%e5%ae%83%e5%b9%b3%e5%8f%b0%e6%9c%89%e6%9b%b4%e4%bd%8e%e5%83%b9%ef%bc%9f%e4%ba%9e%e9%a6%ac%e9%81%9c%e5%8f%af%e8%83%bd%e8%a6%81%e5%8f%96%e6%b6%88%e9%80%99%e6%a2%9d/
不得在其它平台有更低價?亞馬遜可能要取消這條限制