I make my own, it is not difficult. I drill a small hole between two pinned blocks of wood. This hole is just big enough for the brass pin that will form the through hole. I then drill the larger hole, about 3/4" less depth.
Insert the pin, pour, wait 5 seconds then pull out the pin with pliers. Do not wait any longer or the pin will get stuck. Once the pin is out, open the mold and remove the lead.
I can post pics or make a vid if you are interested.
Dave