This one comes from Pam Blanchette and it's a sleeper. The deals listed are for 60 days. It's not available everywhere. But some of the deals can be killer. Check frequently. You won't find what you want every time. Note the prices are for a FULL WEEK. As this is written there is a 2BR condo in SXM for $100. Not a night, for the whole week!
To quote from the site:
When selecting "VIEW BURN WEEKS" you will be viewing weeks with check-in dates within the next 60-days.
When viewing Weeks the price listed in the "Price" column represents the full price for an entire 7-NIGHT-STAY (including full occupancy and taxes)!
http://www.hsiresorts.com/aa.asp