I'm seeing rates at least as low as $50 (including weekends) and with only a 24 hour cancellation policy. On the same nights that I checked, the next best rate is a non-refundable rate of $127.
This offer "will only be active for an hour"
From Twitter:
HILasVegasHotel HolidayInn Las Vegas
book now by clicking bit.ly/aAKi3u
and in about ten minutes I am going to post a code to save you up to 50% off our rates between now and december 30th.
if you are booking Friday there is a two night minimum stay requirement