Have any of you ever tried Tingo.com, which is affiliated with Trip Advisor. I use this frequently and it guarantees me getting the cheapest rate from the day I book until I arrive. For example, I am staying in August at the El Cortez in a Tower Room. The original rate when I made the reservation (and paid for it) was $134.76 for three midweek nights. This included all taxes but not the "resort" fee. My cost has now fallen to $91.92, a 31% decrease. Once I've completed my stay, Tingo refunds the difference. If I cancel, I get my original payment back. Currently rates for those dates for a Tower Room are higher than what my current cost is. It's worth considering rather than having to constantly check to see if a hotel has dropped its rates or some travel site for some reason has undercut what the hotel is offering.