The really good deals come from Priceline's "name your own price" section. You cannot specify a hotel, but you can get a pretty good idea of what you might get by reading carefully the info at biddingfortravel.com. You have to be willing to accept any hotel with the same star rating in the same area before you bid, since once you win a bid your credit card is charged instantly. I've had great luck with them in the resort category, WDW area (in the past, have stayed at Gaylord Palms, Marriott World Center, Hilton at Downtown Disney, etc.), and have also gotten the Peabody in the 4 star category, Universal/Sea World area.