There is certatainly no where or noone that sells dmt containing material in Australia! at least not in the open anyway!       So then the only options u have are to grow your own or else learn to ID Acacias and find some good species to extract from.     People get discouraged from growing their own cos they think of the time it will take etc. Its not as hard as it sounds. Get some psychotria (prob carthagenensis in your climate) for the short term and some acacia for the long term. And when i say long term it isnt really that long. Most acacias are very quick growing and can be ready for harvest in prob less than 10yrs!    If u are completely against the idea of growing then i suggest u look into id'ing Acacia obtusifolia, maidenii or longifolia. All of which u can prob find growing wild around SA.    Good luck!