Air Canada Vacations is selling off seats to St. Maarten (SXM airport code when searching) on Air Canada Rouge for only $298.37 CDN return for April 17-24! Be sure to choose the Flights Tab, and the correct number of passengers, as it defaults to 2. Click here to check it out and to book!
For those last minute vacationers, it's a steal at that price! Cheaper accommodations are available through Air B&B or VRBO for under $120CDN per night. I found 18 availabilites right now for that period, between $28-$120CDN per night for rentals--click here to see.