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Princess Cruises is offering the "All Aboard to Europe! Sale" providing discounted fares to guests who want to spend this summer on a Europe cruise. Passengers who book within the 72 hour window will receive free gratuities – a savings of up to $ 170. A third and fourth guest can book from $ 99 per guest when booked in the same stateroom.

Princess Cruises [princess.com]
Book by Feb 7, 2019

You may also book with known and reputable OTAs who may have their own exclusive incentives for you, on top of these savings. Compare the incentives by using the same trip on Expedia [expedia.com], Priceline [priceline.com] or Travelocity [travelocity.com].