Actually - back to topic, after much searching around I did finally find an Australian based company that specifically covers car rental excess. So I went with that and paid about $30 in total ($4,000 excess cover) instead of the ridiculous $25 per day charged by the rental car companies. As I said before, you never know if you really got a good deal with insurance until you need to claim on it but it looked fine to me. Quite happy I found this actually as I'm sick of being ripped off by rental car companies. (The other ripoff is the e-toll charges - but there's nothing you can do about that but bend over and take it).
The other problem I had was that general domestic travel insurance (with car rental excess cover) as well as credit card insurance does not work for me as I am hiring in the same city as my place of residence, and those insurances do not cover within 200-250km of your place of residence.
The other problem I had was that general domestic travel insurance (with car rental excess cover) as well as credit card insurance does not work for me as I am hiring in the same city as my place of residence, and those insurances do not cover within 200-250km of your place of residence.