There are just two major caveats: you have to be willing to travel soon, as some of the travel dates are as early as August 8th while others are as late as August 31st. Additionally, the fares are "subject to availability," as they say in robotic corporate speak. Be sure to read up on all the fine print on the flash sale page as well before you get too excited.
Anyway, as of press time on Thursday afternoon, we were able to put many of the deals in our cart, including the $60 flight from NYC to San Juan. You know what to do, folks.