I have just taken delivery of my brand new David Clark H10 13.4 mono headset from WadeAir
www.wadeair.com.au in Spring Hill NSW, the headset arrived one day after their stock arrived and was even sent before I had time to get my card details to them, total cost $390 ex GST or about $445 delivered express post including GST, also comes with a generic headset bag. I haven't seen a place cheaper yet, even the US only just beats that price! I spent days researching the cheapest retailer so can pretty much guarantee these are the best.