If you don't mind flying Southwest airlines, check out
www.swavacations.com. I checked for FLL -> LAS for early december staying at the Bellagio. December 11th = 14th Flight (2 tickets) and Lake View Room = $1318.20 The same trip staying at the MGM Grand, is $948.20 These prices are for 2 people (not per person). I have found scenarios, where it was cheaper to use swavacations with a cheap hotel, and not even use it. ie. cheap hotel and flight cheaper than flight alone. The flight to LAS is direct, unfortunately, they don't have a direct flight back (wonder why?).
As for O tickets, a year ago, we had a friend who stays alot at the Bellagio call and got us good seats for about $100 dollars each on short notice. If possible don't sit to close. There is so much going on, it's hard to take it all in if you are too close. The show is fantastic.
For a completly different type of show, Tom Jones at the MGM is fun. He's at the MGM Oct 7 - 20, But plays there alot. No schedule for December yet.
Make it a great trip.