I was at Officeworks this evening and noticed this Logitech keyboard & mouse combo for $28.
I have been using this keyboard & mouse for the last 14 months. It is really good - battery doesn't need replacing often. Also the usb dongle that comes with it is really tiny (not sticking out like those USB sticks - especially good for using on laptops).
Dicksmith had this for $45 (or $49) a few days ago when they were having a mouse sale.
JB HiFi has it for $45.
My first post, hope this helps someone.
update: JB HiFi has dropped price to $28
BrO this is cheaper at Msy