IF I have time prior to my trip I reprice my hotel reservation. Meaning I go to the hotel website and pretend to make a reservation. I had the Country Inn and Suites Washington Dulles booked for one night at the AAA rate of $81. I was happy enough at that price. But I just made another reservation for the same room style and date for $10 less. $70.34 plus tax.
Always make sure you can cancel the higher cost reservation with no penalty. (I book refundable rates because I lose nothing if my plans change.) Then I finish out the lower priced reservation and get a confirmation number before I go back in and cancel the higher priced reservation.
You do not always find a lower rate, sometimes you get lucky like I did today. And I will check it one more time before I leave because it takes me less than five minutes to save some money.