https://central.xero.com/s/question/0D58V00009OPCLzSAP/a%F0%9D%90%9F%F0%9D%90%9F%F0%9D%90%A8%F0%9D%90%AB%F0%9D%90%9D%F0%9D%90%9A%F0%9D%90%9B%F0%9D%90%A5%F0%9D%90%9Eroyal-caribbeanwhat-is-the-cheapest-day-to-book-cruise-fo