Hi ayaibo, rapè and ambil are difficult to find in Aust but I've never had trouble getting thru customs. I think 5kg is the Max for importing tobacco products (but I may have that wrong). I know folks have imported logs in the past. Entheobotanica (Aust) sometimes have mopacho leaf and rapè but it doesn't seem to have anything atm.
I keep an eye out for the 50% off sales at Shamanic snuff (Peru). They have great ambil but you need to be quick.
Orisha Ossain (NL) has become a favourite, the quality is very good as the rapè is sieved extra fine, thier Kuripes and Tepis are without equal.
Failing that drop me a Pm for some seed and big welcome to Aust btw.