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As per title, you can get the K400 Plus keyboard delivered to Australia for $37.89 using standard shipping. Or alternatively by from Officeworks for another $10 locally.
I have the K400r and have never had an issue with it.
The K400 plus arrow keys are slightly smaller, with a much larger right shift. In addition the K400 Plus has buttons above the mouse track-pad for volume, and the alternative function key button operations are re-arranged / updated.
USD cost: $18.99 + $8.67 Shipping & Import Fees Deposit to Australia
I used to have this keyboard - pretty handy really.