Cruise.com via ShermansCruise offers a Carnival Cruise 5-Night Mexico Cruise for Two with prices starting at $548. (On the landing page, scroll to the bottom and click "Book Now" next to the January 15 sailing date.) That's tied with our mention from last week and the lowest rate we could find now by $60. This roundtrip cruise aboard the Carnival Triumph departs from New Orleans, LA, on January 15. Additional fees and taxes may apply. Book this travel deal by August 31.