try AIM surplus. www.aimsurplus.com
And you can use steel all you want. I even use a lot of lacquered steel without problems.
But it's dirty, so you will need to be conscientious about keeping your weapon clean.
Just remember what you learned in basic training.
"Take care of your weapon and your weapon will take care of you."
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost