Caesars is running its Cyber Monday Sale, with up to 25% off all Caesars Entertainment hotels in Las Vegas and up to 35% off in Atlantic City. The pr0mo code is CYBER14.  The offer must be booked by December 5, 2014 and is good for travel between now and September 4, 2015 at most of their hotels. The Cromwell and Nobu discounts are only 10% and are only good for stays through February 28, 2015
Use the Cyber Monday Sale link to see the full list and get the best rates.

When booking, remember to factor in the nightly $25 resort fee which applies to all Caesars properties in Las Vegas.