Now, this is not a set rate and may require some searching on your end.
But a sample run on Orbitz.com for the dates of 4/27/10 – 5/1/10 for a total of 4 nights with coupon code 25HOTELORB came to only $69.47! (Plus $20 resort fee)
It is a 4th night free promotion and then the $25 discount code. Not sure how long this will last, so if play with your dates and see what you can find.
Go to Orbitz.com search hotels for Las Vegas, and then once you select your location near the bottom at the total is where you enter the discount code.