See if this helps: http://www.vegaschatter.com/story/2013/2/14/133253/571/vegas-travel/VegasChatter%27s+Guide+To+March+Madness+Parties
If you're on Facebook, there is a great group called March Madness in Las Vegas that some TA folks created. People are always submitting updated information about parties, prices and whatnot.
For a single drinker, Cosmo or Caesars has the best package, but group of 8-10 is Cosmo for sure. Cheaper on a per person level and better amenities.
MGM properties typically do nothing for MM. I don't expect anything different this year.
I should clarify that I mean nothing in terms of public viewing parties. MGM properties are still lots of fun during MM, you're just on your own to find a viewing spot and a seat.
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