I buy my EPP/UG's from the Mule Burro Corral. He will cast them in whatever lead/tin alloy you request. I pay $90 for 750 of them (shipping included) cast from the softest lead. Professionally packaged in plastic-wrapped styrofoam trays.
He doesn't have the EPP/UG's up on the site yet....it's a work in progress....if you don't see what you are after give him a call.
You can also buy the EPP/UG mold here.
Got Rasp? Butcher's Game Calls: Home of the Excruciator...the Original Borosilicate Game Call