Spirit Airlines is having yet another 1 cent sale. Seats will go fast, although the official end date is March 7, 2007 at midnight (11.59 PM to be exact) EST.
The catch (there's always a catch with these things) is that you can only travel on certain dates (just four days for each fare in each direction). So for example, Ft. Lauderdale to Montego Bay is 1 cent (plus a ton of taxes of course) on April 7, 13, 28 and 29; but the returns are on May 25, June 1, 2, and 8. Most people aren't gone to spend 4-6 weeks in Jamaica (well, some people would I suppose). However, even if you get the 1 centers just one way and pay the regular fare the other way, you'll still save money.
Check out the entire roster of fares here.