We wanted a ultraspacious ocean view cabin for 3 people on Harmony of the Seas sailing on 11th August. Cheapest deal we found in UK was Iglucruise for £4582. Two US agents (MEI travel and American Discount Cruises) both comfortably beat that price, with the lowest price being American Discount cruises - £4367 with $400 onboard cash. Definitely worth looking into.