Cruise.com offers a Carnival Cruise 4-Night Cozumel Cruise for Two with prices starting at $598, as provided by ShermansCruise. (Scroll to the bottom of the landing page and select the August 24 sailing date.) That's tied with our mention from last week and the lowest price we could find for such a cruise in August by $120. This roundtrip cruise aboard the Carnival Sensation departs from Miami, FL, on August 24 with stops in Cozumel, Mexico; and Key West, FL. Additional fees may apply. Book this travel deal by May 31.