Samsung AU currently has this deal which reimburses you for the purchase of an S View Case and a Battery Pack but it also seems to just simply take $148 off your purchase.
This brings the cost of each phone down to as follows:
S6 32GB: $851
S6 Edge 32GB: $1001
S6 64GB: $1001
S6 Edge 64GB:$1151
As far as I know, this is the fairly cheap for Local Stock, Local Warranty and Free Express Shipping.
EDIT: Seems like the code has been fixed and now just reimburses you for the purchase of a S View Cover and Battery Pack with a regular S6 order, making it a bit worse than the NBUY10 code.
It still seems to work for taking off $148 for the S6 Edge however.
You can still get a 4% cashback from Cash Rewards too.
I get code no longer valid when trying it on a random phone purchase, maybe they've pulled it?