wood craft has them.
and the reason i dont like doing them is I like them to all be the exact same shape and style, not easy for me.
weight is not that big of a problem if you buy an inexpensive digetal scale.After you pack the lead in the tubes to achieve the right weight add a little super glue to keep the lead from moving around while they are being thrown around.
I dont know why the forum let me post a pic this big but i am not messing with it.