Just a suggestion but maybe posting this in Workbench would be better? I know you've posted in VSF because that's what you're doing, but the fact it's a VSF army is kinda irrelevant to the terrain question, isn't it? It's more about 'is there a (cheap reliable) supplier of 2mm trees in Australia?' I'd say.
I hesitate to send someone to another forum, but TerraGenesis is about the best terrain-making forum on the web in my opinion, and there are several Australians on it who must be getting their supplies from somewhere (I know it's a big place though, and none of them might be working with 2mm trees).
Maybe you could ask around over there as well as here? The url is
http://www.terragenesis.co.uk/ - there may even be a way you haven't thought of to scratch-build them (probably out of old pan scourers and twigs or maybe paper clips with masking tape on them, if I'm any judge at all).