No, it's not the insanely low fares JetBlue just had in their two-day flash sale that had $34 one-way flights, but this is a pretty fine deal. The airline is taking you to San Juan, Puerto Rico with some very cheap fares.
With a little help from ITA Matrix Airfare Search, you can grab a round-trip flight for as low as $126 flying in late January and early February. The cheapest of these fares is headed out of Fort Lauderdale, Florida. Prices climb from there, but there are still some good deals. Round-trip out of Boston is just $179, Philadelphia is $221, New York City is $223, Baltimore is $232, and flying out of Chicago costs $251.