For last-minute pricing with Celebrity, check out
http://www.creative.rccl.com/Sales/E...s_cel_tues.pdf. Generally viewable on Fridays, and the deals can be booked as of Tuesday (sometimes only for 24 hrs., sometimes for 48).
Some of the best pricing I've found has been through
www.crucon.com Get on their mailing list and you'll be getting some great deals on a regular basis. (although not much "hand-holding", so you'll need to do some research on your own about what type of cruise you are looking to book.)