The Nile Premium we would be on supposedly (based on everyone's comment, you do not know which boat you would be on until the day you sail!), the prices for Oct to April are as following - and I believe they are the same amount at the time Misr switched us to, more than 2 months ago. I am 100% sure they are much higher than the "bargains" you found on the net based on your comments back then.
https://www.luxorandaswan.com/Egypt/cruise/Nile-Premium-Nile-cruise-
Triple occupance - $576 pp
Double occupance - $643 pp
Single occupance - $959 pp
Tips are extra - the boat would put out envelopes on last day and the passengers are expected to pay tips to the crews. The guides that go out with you on all sightseeing activities (included), also expect to be tipped. Of course how much you are willing to tip is up to you.
Though I suspect the above prices would not be true prices. Because their bookings are like most local providers, you send an email inquiry then they respond to you. TripAdvisor reviews suggest they are responsive.
Personally I found TripAdvisor Travel Forums are quite useful to find information, though the information are in piecemeals that require a reader has ability to shift through. Other sites such as Forders, Lonely Planet, Rick Steves, their communities tend not as active as TripAdvisor. Therefore the info found are not up to date.
Another useful site is Flyertalk, particularly useful for airlines and hotels, as well as airports. They also has Travel destination but not as specific as on TripAdvisor.
