Fletcher etal - If people are still having trouble getting rooms or if they are sold out of our group rate, go to Expedia.com. To my knowledge the only downside of buying through them is that you cannot have your play adjusted by a host at the end of your stay. If that matters to you, then dont book through them.
However their rate for 3 nights at Sunset 1/24-1/27 is $338.29. So if MJ's rooms sell out and you still want to stay there, this might be an option for you. If you want to stay on the Strip, there are still a number of hotels you can get 3 nights for @$400.