For those that venture onto sites like wotif and lastminute.com.au, you'd be aware of some of the 'Mystery Rooms' they have - where basically you can save big, but all you know when you put the payment through is the star rating and roughly where it is (I've found wotif to be quite vague with locations whereas lastminute.com.au is a bit more specific).
Anyway I noticed one on lastminute.com.au for a trip I'm making to Sydney in August (3 nights, 4 days), which was 4.5 stars for $105/night. Waiting to save enough money to pay for it, it did go up to $115/night, but I was still happy to pay that. So put through the payment, and the hotel is revealed as Crowne Plaza Darling Harbour! I did a check on their website and their cheapest rooms for the nights we're there started at $165/night, and another site I checked out are charging $221/night!
So if you're not fussed on where you want to stay, and basically want to go on the star rating and a list of facilities in picking a place to stay, give the mystery specials a shot as you can make some big savings - we saved $150+ in this case!