For those of you who can't find .41 Magnum pistol brass it's right here.
You won't find .41 or .45 Colt brass laying around because these are manly revolvers and not for noobs. People who own them keep their brass and reload them.
Lee makes two different .41 molds so for $20 you have an unlimited supply as long as you can find lead.
Or Midway offers 20 different types.