Hi Miss H, I don't know how much use I can be with this one as I live on the other side of the country. Maybe some other Aussies on CZ, that live in Sydney can help. For bulk herbs I find that chinese herbalists are the best, they know what they're talking about, and their products are usually clean. There are good chinese herbalists in china town in Sydney, this would be a good place to start.
Any company that sells herbs in Australia, (not from overseas), must comply with extremely strict laws in regards to the purity and cleanliness of their products. The products are well labeled and must contain what they say it does.
I would also point your friends towards Tony Issacs forum, there are some very good protocols there for the treatment of cancers.