Amazon has Just Dance 4 for the very low price of only $19.99 right now down from $40! You can get it for $19.99 for all of the game systems right now and it is highly rated on Amazon!
Product Description:

Top Of The Charts – Just Dance 4 has over 40 all-new songs, ranging from current Billboard hits, legendary favorites, and classic dance party tracks!
Just Dance-Off! – Challenge your friends in 6 rounds of dance battles with the all-new battle mode!
Bring Your Crew – Each player can get his own moment of fame with unique choreographies and moves for each member of your dance crew.
Just Sweat It Out – The popular Just Sweat mode gets a major upgrade with brand new workout sessions, personalized programs, live feedbacks and a real calorie counter.
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Pricing subject to Change at any time. Please make sure you check the current price on Amazon.com before purchasing.