If you have an American Express card, access your mobile or online account. In the "offers" area, you could have an $100 off of $500 to spend at NCL offer that you can add to your account. I am not quite sure how this offer is assigned. It may not be for all cards (gold, platinum, business, etc.) or for all cardholders. This is the second time I have received the offer in the last year. Luckily, I have had balances to pay on cruises so I was able to use it.

Happy Shopping/Cruising!

Details
Get a one-time $100 statement credit by using your enrolled Card to spend a total of $500 or more to purchase a cruise with Norwegian Cruise Line via NCL.com, by phone or through your travel agent between 2/10/17 and 4/30/17. See terms for exclusions.TermsOffer valid for qualifying reservations between 2/10/17 and 4/30/17. Includes spend for booking directly via NCL.com, phone, or through travel agents. Excludes purchases onboard, Norwegian gift cards, shore excursions and transportation to and from the ship. Excludes RCL, Sixthman, and Kloster. Valid only on US website. Check to make sure prepaid cards are accepted before attempting to use your American Express Serve or Bluebird Card to take advantage of this offer. Please note that hotels, car rental companies, cruise lines do not accept prepaid cards for charges authorized in advance, although prepaid cards may be used to settle the final bill. Check to make sure prepaid cards are accepted before attempting to use your prepaid card to take advantage of offers for these merchants. Enrollment limited. Must add offer to Card and use same Card to redeem. Limit 1 statement credit(s) per American Express Card across all American Express offer channels. Statement credit will appear on your billing statement within 90 days after 4/30/2017, provided that American Express receives information from the merchant about your qualifying purchase. Note that American Express may not receive information about your qualifying purchase from merchant until all items from your qualifying purchase have been provided/shipped by merchant. Statement credit may be reversed if qualifying purchase is returned/cancelled. If American Express does not receive information that identifies your transaction as qualifying for the offer, you will not receive the statement credit. For example, your transaction will not qualify if it is not made directly with the merchant. In addition, in most cases, you may not receive the statement credit if your transaction is made with an electronic wallet or through a third party or if the merchant uses a mobile or wireless card reader to process it. By adding an offer to a Card, you agree that American Express may send you communications about the offer.