Well there is a website called Priceline.com (popular in america, but no one seems to know about it over here) where you choose the city you want to stay in, you choose the area of the city you want to stay in (kissimme, wdw area, international drive, etc), then you choose the hotel rating category you are willing to accept (2, 3, 4, 5 star, resorts) and then you type in the price you are willing to pay. If priceline comes back with a hotel then they book it for you. You can't choose your hotel but all the hotels are well known names.
The hotels which people have got from selecting the resort category include:
Resort Gaylord Palms Resort
Resort Hilton (in downtown disney)
Resort Wyndham Palace Resort And Spa (in downtown disney)
Resort Hyatt Regency Grand
Resort Marriott World Center
Resort Omni at Champions Gate
Resort Wyndham Palace Resort And Spa
If your 'bid' is rejected you can either change part of your selection or wait 3 days to play the same bid again.
Some people think its risky, but i dont mind where i'm staying, and all the hotels are good quality and the price can't be beaten. I have used priceline twice now and got much better hotels than we would have usually been able to afford.
If you need any more information then i can help!