Being in Aus, there are few suppliers, but try "OneSteel" and "Lysaught" in your state.
I'm guessing that you are after retail quantity. I've found that at times the local "shipwright" companies cary a fair range of bright steel and Al materials or at least have been helpful in sourcing items that were needed.
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Just an Engineer from the land down under.
We are a small company established in 2004 and since then we have been supplying all sorts of secondary raw material, especially steel. We often do exports after buying steel locally here in Canada. I am pretty sure we can get the cold rolled bars that you need. Please contact me if there is any more information you would like.