Amid the tidal wave of fantastic deals on Caribbean getaways, JetBlue has unveiled a More Beach for Your Buck Sale. The airline is selling 5,000 packages that bundle roundtrip airfare plus three nights accommodation for $599 or less per person. Destinations include Aruba, Bermuda, Cancun, the Bahamas, Dominican Republic, Puerto Rico, and St. Maarten/St. Martin.

Actual prices depend on both the departure city and chosen resort. When we price-checked this deal using different departure cities, it quickly became clear that the "$599 or less" price applies only if you're flying non-stop from an East coast airport served by JetBlue—and even then, not always.

When we ran the numbers online for a family of four (two adults, two kids aged 5 and 9), here's what we found:

Flying New York JFK to Aruba for a three-night, Thursday-Sunday stay in mid-March, the package comes to $2,211.69 ($552.92/person) if you stay at the Westin Resort, Aruba (aerial of the pool area, right).

Flying Boston to San Juan for a three-night, Thursday-Sunday stay in early March, the package comes to $2,464.59 ($615.65/person) at the Four Points by Sheraton Resort and Casino at Palmas del Mar or $2,645.59 ($661.40/person) at the InterContinental San Juan Resort and Casino.

Note that JetBlue is limiting this sale to 5,000 packages. In other words, it's a limited offer and you need to act fast if you're interested. You can book online or by calling 800/JETBLUE, option 3. You must book by December 31 for travel between January 3 and March 31, 2009. Blackout dates are February 12 to 22 for the entire promotion; some individual resorts  have additional blackout periods.

Deal or no deal? A deal, but only if you live near a JetBlue-served East coast airport such as New York's JFK.