Update (7:10 pm ET, September 20): This sale has been extended for bookings through Wednesday, Sept. 26.

For 48 hours only, a weeklong Caribbean cruise in December aboard the Norwegian Epic -- the cruise line's newest and largest ship -- is $489 per person. This is $570 per person off the cost of surrounding dates.

As an additional perk, cruisers will receive a $50 on-board credit per cabin in addition to all meals and entertainment.

Sail from Miami and stop in St. Maarten, St. Thomas and the Bahamas. Sail for (including credit):

• $489 ... Dec. 1
• $499 ... Jan. 19
• $529 ... Nov. 24; Jan. 5, 12; Dec. 8
• $549 ... Nov. 3, 10, 17 (Thanksgiving sailing)
• $899 ... Dec. 22 (Christmas sailing)
• $1079 ... Dec. 29 (New Year's sailing)

The Epic was voted Travel Weekly's 2011 Best Cruise Ship and features 21 dining options, including a 17-degree ice bar, an aqua park, climbing and rappelling walls and shows by the Blue Man Group.

As an additional bonus, January departures booked by Friday receive a 50% reduced deposit.

Note: Taxes are an additional $113 per person.