Found through GG Deals, which explains the GGD 10% off code.
Alternatively, you can use the code BETTERTHANVB, which gives you the same 10% off.
The Alex Murphy Deluxe Edition is also available for $40 if you're so inclined.
As far as I'm aware, this is the current all time low for both versions, at least where official storefronts are concerned.
EDIT:
Had it as "51% off", but $33.34 would be more accurately described as 55% off the current standard Australian price on Steam.
What's ozbargain opinion about the game. Is it worth the Price?