Sine Mora PC for $2.60 (AU) from Green Man Gaming.
Green Man have issued another voucher code - this time for 20% off (looks like the 30% is still valid as well).
They have Sine Mora out on sale at the moment at $3.26 (AU converted from $3.39 USD). Applying the 20% off to that gives you the game for $2.60. Pretty cheap