Costco members can sign up for emails. Also in the travel section of their website. I think you have to log in as a member.
It's the week after Black Friday.
New deals get added every day. The deals are good for at least one day, up to 3.
Edited to add sign up for emails with travelzoo. Also sign up with whatever cruise lines, tour operator, resort etc that interests you.
I sign up for emails from Marriott, Hyatt and most of the airlines.
They usually have some sort of deal that they email out.
I am in Canada so I follow the “hot deals” section of my favourite shopping forum for Canadians. By the time someone posts it there, most of the deals are gone. But what I do is I look back at last year’s deals and it usually gives me a good idea of what might be coming up.
If I’m shopping in the USA, I usually check Slickdeals or Brads deals and I sign up for emails from blackfriday.com
Most airlines will have Black Friday or more likely Cyber Monday on Flights. It is best to decide where you want to go and dates start checking now to know if the flight and date are discounted As not all are.
Busch gardens/sea world has black Friday deal on fun card and annual passes. Also I keep getting NCL second passenger sails free deal for Black Friday if you want to cruise.
RCL is also doing a "sale" this weekend... DCL upped their Disney+ sale...
But you do have to watch out for some travel related products (air, hotels)... that are tied to dynamic pricing, as there will be lots of folks booking vacations... while on holiday.