Bulk cornmeal source in Brisbane region?

Hi.
Any suggestions where I can source cheap cornmeal near Brissie? It is for a home remedy so can be non grocery grade.
Pet or stock supplies maybe?
I hope bulk buying can improve on the $4 per kilo I have seen online.
Note, polenta is a corn product that Google keeps suggesting , but I haven't seen it cited as a substitute remedy, so I won't try it unless its bargain cheap.