Power of Hotwire!
I just tried to extend my stay with the front desk at the Omni in Atlanta, they said the cheapest room rate is $149. When you add 20% tax--High. We'll I'm paying $76. So I go to Hotwire: the unique aspect of Hotwire is you don't know the hotel you will get before you make the final payment. So I found a $76 per night room and bingo I'm back at the Omni for $76 vs $149.
Check out www.hotwire.com I'm a believer!