Try crucon.com They usually have sales during the retail holidays. For today and tomorrow, I see a RCCL Western Caribbean sale. They've offered some great deals in conjunction with travelzoo in the past and offer a $25 off 7 day cruise for crucon loyalty members.

Also try the Tuesday deal from RCCL http://www.creative.rccl.com/Sales/R...ales_event.pdf

http://www.cruisehotsheet.com/ is also a good site to try and I think it is in conjunction with vacationstogo.com