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I believe this is the lowest price for Deus Ex 3 so far (it was $10 on Amazon about a week ago).
You could get another 15% discount (final price for me is $6.37)if you did this offer: http://www.ozbargain.com.au/node/63671
Not sure if the IGN Prime offer has been expired or not though.
Don't forget that it's redeemable on Steam :)
Game description:
You play Adam Jensen, an ex-SWAT specialist who's been handpicked to oversee the defensive needs of one of America's most experimental biotechnology firms. Your job is to safeguard company secrets, but when a black ops team breaks in and kills the very scientists you were hired to protect, everything you thought you knew about your job changes.
Great certainly the cheapest, plus you can get all the DLC for under a fiver!