Darksiders ~ $4 and Darksiders II ~ $10 - PC - Steam
Cheap deals on these highly rated games....80% off as part of their weekend deal.
The DLC is also 80% off.
Link to Darksiders 2:
Don't forget, you can score $20 and $50 USD steam cards for $20 / $50 AUD at EB Games, saving you around 10% with the current exchange rate ;)