SlickDeals has a deal on the Mandalay Bay for the summer. Rates start at $64 but most good rates hover around $80.
There is also tax and a resort fee.
Book using Offer Code: MRC1RC
Features room rates starting at $64/night.
Available on select dates: Now through August 29th, 2013
Book by: July 31st, 2013
Daily resort fee: $28