Not nearly as neat, but you can accomplish the same thing with a soup can. Cut a hole in the side to pour out the soup, then trim it to fit snugly around a section of pipe for a handle. Dry the can thoroughly (eg heat it with a torch) and make a nest to hold it with the hole on top. Pour it almost full of molten lead and stick the handle in. After it cools, cut and peel the can away.
Not sure if it's still true, but it used to be that tire shops would give you old wheel weights for the asking. There's probably still 60# of them in my Dad's garage somewhere.
But I just picked up a couple of brass hammers at HF, when they were on sale for about $8 each :laugh: