Big cardboard box until they are tumbled, then sorted, by calibre, into white plastic tobacco tins which I label with a black sharpie.
I bring them home from the range in an old green 50 cal ammo can which I empty into the cardboard box. (It's just easier to carry to and from the range than the box.)
Other than the ammo can which I think I paid a couple of bucks for at a garage sale, none of it cost me a penny.
And if the other guys at the range don't want to clean up their brass, that leaves more for me, also free.