Both Ceasar's palace and the Mirage have excellent Sportsbooks, BTW great place to watch a game, place a $2 bet, and drink free all game.
The odds from big Casino to big Casino are usually pretty much the same. You might want to take a side trip to "Glitter gultch" and see what the odds are in the smaller casinos, but you are mostly going to find the Pats @ 7-1, if you have a hunch about an NFC team, I would bet them to win the NFC Championship, you could probably get some goods odds on teams other than the Panthers or Cowboys.