I use hotwire or priceline. This website helps Priceline and Hotwire Forum to figure out what hotels you are bidding on with hotwire and what prices have recently been accepted on priceline. Remember if you use priceline you can do multiple searches for the same date just by changing the name of the suburb/city.
You can try using discount codes for the hotel as well. These are often company specific or promotion specific codes. For example, here are some Marriott codes you could use when you book through their site;
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