Well pickandmix don't even send to down under anymore. Neither do Attitude.
I've been using http://www.worldwide-marijuana-seeds.com/ with much success.
They're pretty much the same as PnN with individual seeds.
So that's another option for you if picknnix let you down.

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I don't see a problem with growing small quantities of cannabis to supply ones own medicinal needs. I do not par-take in, or condone, the illegal growing of cannabis for commercial purposes.