The cost of Microsoft Office

I needed to buy Microsoft Office for the kids.
The MS web site advised me that there are two licensing options
For 1 pc $189 and for 3 pcs (in the one house) $209. (Download).
Figured we would go for the 3 license option.
So I figure how about Harvey Norman $168.  Wow that's better.
What about Office works I wonder $143.  This is good.
JB HIFI matches Office Works also at $143.  I guess that must be as low as it goes.
But then I figure how about UMART  $119.  But I would have to drive to Milton.
I wonder about GoComp.  They are on my way home and amazing $113.

Placed my order.  Picked it up on the way home.

BTW, Open Office is free and is on my computer.