Microsoft MCE Remote Control InfraRed and Receiver w/2 IR Blaster For VISTA or MCE $79 @ Netplus
I had a scout around and couldnt find stock elseware.
Stock Availability for Osborne Park 20+ & at Myaree less so best call first.
Or buy online and use "ocaudelivery" code
Instructions: This code gets free shipping at NetPlus. You probably also have to add your Overclockers.com.au forum username, but I do not know if they check this out - it wouldn't cost you anything to make an account there anyway.
Or pay $12 delivery.