Update (8:36 am PT, July 27): This sale has been extended for bookings through Tuesday, July 31.

For $879 per person, cruise through the Caribbean in a balcony cabin on the world’s largest cruise ships and get more than $350 in extras.

Current rates for this exact cruise on Royal Caribbean's Oasis or Allure of the Seas go for as much as $1150 per person. These sister ships are nearly as long as four football fields.

Sail roundtrip from Fort Lauderdale in a balcony cabin for the following per-person prices:

• $879 ... Oct. 6 (Oasis)
• $899 ... Sept. 15, 29 (Oasis)
• $929 ... Oct. 21 (Allure)
• $949 ... Oct. 7 (Allure)
• $969 ... Dec. 1 (Oasis)

Some sailings have Western itineraries, often including ports in Falmouth, Jamaica, and Cozumel, Mexico. Others have Eastern itineraries, often with ports in Nassau, Bahamas; St. Thomas and St. Maarten. Additional dates for these seven-night cruises are also discounted.

This deal also comes with these extras:

• Prepaid gratuities
• Dinner in the specialty restaurant for two
• $100 onboard credit per cabin

Both ships feature a zip line, two surf simulators, a 3-D theater, character interactions from DreamWorks and the Broadway musical "Chicago."

Note: Taxes are an additional $113 per person.

Click here for more information. Book a balcony cabin or higher on any seven-night cruise on the Allure or Oasis in 2012 or 2013 to get all of the extras listed above with this sale.