If what you want is a last minute deal, you should check out the sites below that list discounted vacation specials. You should also check out the all-purpose sites under General Travel Sites, many of which also have last-minute deals.
11th Hour Vacations
This site is loaded with special deals from cruise vacations to resorts.
The deals on this site are not very well organized, though you may be able to find a deal that works for you.