This is from the US store so you will need a US account/US Address to buy them. I'm pretty sure a lot of people have their Kindle registered this way. These might be cheaper from the Australian link but I doubt it.
FREE:
The Whitefire Crossing (The Shattered Sigil) $FREE (Normally - $7.99)
Wool 1 - Hugh Howey $FREE (Normally - $.99)
$.99:
Taliesin (The Pendragon Cycle) - Stephen R. Lawhead $.99 (Normally - $7.99)
$1.99:
Leviathan Wakes - James S.A. Corey (Also includes a free copy of "The Dragon's Path") - $1.99 (Normally - $9.99)
The Gun Seller - Hugh Laurie $1.99 (Normally - $9.99)
The Black Prism - Brent Weeks $1.99 (Normally - $12.99)
The Killing Moon (Dreamblood) - N. K. Jemisin $1.99 (Normally - $9.99)
Fracture - Megan Miranda $1.99 (Normally - $9.99)
Heart-Shaped Box - Joe Hill $1.99 (Normally - $6.64)
$2.99:
The Sisters Brothers - Patrick deWitt $2.99 (Normally - $11.99)
$3.99:
American Gods: The 10th Anniv. Ed.: [Kindle Ed. with Audio/Video] - Neil Gaiman $3.99 (Normally - $14.99)
I will add any more books I find and also update when the prices end. Thanks heaps to Foobar for showing me how to format nicely :)
I changed one for you, if you like it copy the formatting over to the others or I'll do it if you prefer.