cOMPARE the Perth Mint with the other dealers - Aurora et luna, Bullionbourse, Bullionmark, Ainslie, ABC (times 2) etc etc. Much of this can be done online. See some of the sponsors to this site... I was assuming gold? For other places have a look at the recent thread "Your usual purchasing place"
To my knowledge there arnt any local manufacturers of bullion 1oz bars only coins. The only ones you will get are imported bars such as Morgans and PAMP bars. And some of the dealers listed will have them. You will need to shop around as prices may vary.
the copper cave sells 1oz bars http://coppercave.com/copper/ you can email the owner directly for anything that's not on the site and he will sort you out.