May 6, 2018 9:15pm Central Time - I just looked at www.vacationstogo.com and see many for May 7, 2018 (in many different areas of the world and many different cruise lines). Their office hours are until midnight during the week and 10pm on weekends. I haven't followed through and actually contacted them, but the listings suggest it would be possible. You might check this site for cruises by the line in which you are interested, and see how close they show availability for an immediate date. If you want to take it further, you could also call them for a current cruise and see if it really is bookable.