Cruise.com offers a Carnival Cruise 7-Night Western Caribbean Cruise for Two with prices starting at $1,018, as provided by ShermansCruise. (On the landing page, scroll to the bottom and select the September 16 sailing date.) That's the lowest price we could find today for such a cruise in August by $320. This roundtrip cruise aboard the Carnival Freedom departs from Galveston, TX, on August 26 with stops in Roatan, Honduras; Belize City, Belize; and Cozumel, Mexico. Book this travel deal by June 30.