Headtube extender wanted

I'm looking for an AU supplier of a 20mm headtube extender like this one:

http://www.eighthinch.com/29-eighthinch-headtube...

Anyone know where I can get one? Shipping from Eightinch is $45 !!??

Need a 20mm lift to make up for a rigid fork conversion (turning my old hardtail into my road bike)

Any help would be much appreciated.