You're lucky if you got a great price. We haven't booked yet our flight to SXM for Feb. Nothing under $750 per person R/T from Pittsburgh. It's $120 more than what we paid this year and these $630 per person were already much more than in 2014 ($540).
I am at a point where I'm close to giving up going to SXM for 1 week. That's $220/day for 2, just for airfare. Add to that the MFs for the TS + car rental + food and fun and we're at $4,500 for a 1 week vacation there.
Rant over.....