Cheapest room in Vegas

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Anyone know of the cheapest rooms in Vegas on or close to the Strip? Is there a website, like expedia, that would be best to go through?

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In addition to my post on Casino Royal above, check out the Sahara on sites like Travelworm and Vegas.com. They typically run in the lower 40's per night(Sunday-Thursday) and there is a monorail stop there which makes it really convenient.