I'm having a hard time getting some acme thread and nuts in Australia.

Ive found some well priced ones on use-enco but they want to charge me $400p+h for a $50 total cost!

Does any one know where to get any? it doesnt have to be to size I can cut it, the logest lenght I need is 700mm
and pref. 1/2" 10?

thanks