In this market anything goes, I'm seeing some 223 on shelves again so I think the market is softenning on components.
I usually figure that ONCE fired brass is a fair deal at half the price of new all the same headstamp, new brass runs $25/100 so $10-$15 would be a fair price in my opinion. The Grafs catalog has used 223 brass at $79/m when they have it.