Cruise.com via ShermansCruise offers a Royal Caribbean 4-Night Bahamas Cruise for Two, with prices starting from $458. (On the ShermansCruise landing page scroll down and click "Book Now" next to the November 26 sailing date.) That's the lowest price we could find by $120, and the best price we've seen for a 4-night cruise on Royal Caribbean since the week of Black Friday. This roundtrip cruise aboard the Mariner of the Seas departs on November 26 from Miami, FL. Additional fees may apply. Book this travel deal by October 31.