The cheapest hotel/airfare combination is $679 for a decent hotel near the strip...flying out of Grand Forks, North Dakota. I tried finding flights on Allegiant Air which has $69 round trip fairs from Fargo to Las Vegas (Allegiant Air is a Las Vegas destination-only airline) and air/hotel deals for $204...BUT... they don't begin service into Fargo until 11/7/05.
I'll go next year though, I promise!