If you don't want to reload, I believe CMP still has Aguila carbine ball ammo for .40 a round, not too bad. They also have Winchester ball for .45 a round. Both are boxer primed and reloadable or sell the brass for about .20 on GB and end up paying .20 a round for your ammo. Really hard to reload for that unless you go to the bother of casting.
"Some people spend an entire lifetime wondering if they made a difference in the world. But the U S Armed Forces don't have that problem."... Ronald Reagan
When in doubt, empty the magazine.