Does anyone know where I can find new microphones for my xbox (not 360)?

Konami sell them here:

http://www.konami.com/Konami/ctl3810/cp20114/si1588408/cl1/karaoke_revolution_microphone_for_xbox

but they don't ship to Australia.  I can't find them on any Aussie video game sales sites.  Anyone got any ideas, other than using the communicator headset mic?