Last Minute Deals On Hotel Rooms

I was using the "Last Minute Hotel Deals" sites, as well as priceline.com and get a decent room in the hotels.

However, I see 4 or 5 stars (such as Ritz Carlton or Mandarin Oriental) have their rooms listed on those sites. I think there must be a pricing policy that prohibits them from advertising on these sites, but at the same time, is not it better for them to have paying guests, instead of having empty rooms ?

Does anyone know any website that lists the rooms in hotels higer-end?

Thank you in advance for your contribution!

try http://www.hotelreservations.com/

http://www.hoteltopten.com/