https://help.annke.com/hc/en-us/community/posts/38257532752281--ROYAL-%F0%9D%9F%AD-%F0%9D%9F%B4%F0%9D%9F%B4%F0%9D%9F%B4-%F0%9D%9F%B3%F0%9D%9F%AF%F0%9D%9F%B4-%F0%9D%9F%AC%F0%9D%9F%B4%F0%9D%9F%AD%F0%9D%9F%AE-What-day-of-the-week-do-cruise-prices-drop