Hoping to follow up on a great first post of the 3DS :)
DJ Hero 2 is a fantastic game, Unfortunately I bought it for $79 a while back, but I can tell you from owning it that it is not a rubbish peripheral game, but of much quality and fun :) The reason it is so cheap is that Activision is Discontinuing the Guitar Hero/DJ Hero line altogether and therefore, these are being cleared out.
IGN - 8.5 (http://au.ps3.ign.com/objects/057/057891.html)
Metacritic - 88 (for Wii) 86 (for PS3) (http://www.metacritic.com/game/playstation-3/dj-hero-2)
For all consoles (Wii, 360, PS3) with stock online for 360 and Wii, but PS3 is an "in store only". (As at 5.52 PM adelaide time)
Enjoy!
UPDATE: EB GAMES ARE ALSO SELLING BOTH BUNDLES FOR THE SAME PRICE, YOU ALL SHOULD BE ABLE TO LAND THE DEAL! :)
UPDATE 2: GAME ARE SELLING THE BUNDLE FOR $38!
http://www.ebgames.com.au/ps3-150890-DJ-Hero-2-Bundle-PlaySt…
For those after the ps3 bundle online. $40 at ebgames as well