Back at it again.

By Brad Tuttle
June 21, 2017
Bloomberg—Bloomberg via Getty Images

JetBlue Airways just floated a new round of super cheap “Flash Fares,” with last-minute flights on select routes and dates starting for as little as $20.

Here’s a sample of the one-way deals:

Boston to Martha’s Vineyard on July 4 — $20
Philadelphia to Boston on July 6 — $20
Charleston to Washington, D.C. (IAD) on June 28 — $30
Martha’s Vineyard to New York (JFK) on July 2 — $30
Portland to New York (JFK) on July 1 — $30
Washington, D.C. (IAD) to Boston on June 27 — $30
Salt Lake City to Long Beach on June 29 — $40
Orlando to Boston on June 21 — $40
Orlando to New York (JFK) on June 27 — $50
Chicago to New York (JFK) on July 7 — $50
Boston to Dallas on July 3– $60
New York to Nassau, Bahamas, on July 4 — $70

JetBlue has launched several flash sales like this in recent weeks, always with the same stipulations and fine print. Availability at these prices is extremely limited, and is only valid on specific flights and dates. Travelers can expect seats at these fares to sell out in a hurry too.

The other hangup for travelers is that these fares are only good in one direction. In other words, you’re on the hook for the return flight, assuming you need one — and odds are that portion of your airfare will be considerably more expensive than the flash sale price.

All that said, if any of the flights work with your schedule, there are some outstanding deals to be had. Act quickly!

This story originally appeared on Money.com.

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