I'm looking at getting into reloading with a couple of friends. Between us, I think we have a good handle on sources for equipment, bullets, powder, etc. The only thing we're struggling with is a good source cost-effective brass cases. Does anyone have some suggestions for sources for common calibers? What are good prices in people's experience?

If it matters, specifically we're looking for .308, .223, .40 S&W and .38spl.