It's January, so it must be wave season. That's the six-week window when cruise lines traditionally float their best promotions. The deal-finding site Travelzoo just posted a very sweet offer from Brennco, a family-owned travel agency specializing in cruises. On the table: A seven-night Caribbean cruise aboard the MSC Orchestra for just $429 per person—that's just $61 a night! As usual with MSC, kids 17 and younger sail free when sharing a stateroom with two full-fare passengers, so a family of four could sail for as little as $860.

This deal is good for the March 7 or March 21 sailing. Book by January 15 and you can also get up to a three-category upgrade.