Priceline.com for cut-rate rooms
The Name Your Own Price feature of this dotcom-era pioneer of travel deals is still the best place to score a luxury room: choose the neighborhood and star ratings you'd prefer, enter the price you’re willing to pay and your credit card information—and then bid away. If your bid is accepted, your credit card is charged and the room is reserved. If it's too low, you won’t be charged and can try again. The same functionality goes for airfares and car rentals.