Wow, I guess we got lucky... you guys are talking about flying out of Philly, right? When we first started, airfare was $440 on US Air. We waited a few weeks, and it dropped to $355 (including all taxes) to Montego Bay.
The one thing I would say is that flying out of Philly international is a pain on US Air. They don't skycap checkin for international, and the line is insane. When we booked our tickets we had to do it at the airport b/c we had travel vouchers from a refund for a previous trip. They don't actually have a ticketing agent line. We had to stand in the international departures checkin, and it took almost 2 hours to get through the line! If the price hadn't been so much better and if we didn't have $200 in vouchers, I would've flown Air Jamaica...
In the end I can't totally complain, because we got bumped up to first class for free (woohoo!). We asked for a manager because after the 2 hour wait, they still couldn't figure out how to book us with the travel vouchers! His resolution (because we were fuming at this point) was to upgrade us. I've never flown first class, so that's cool.