Cast Industries has the ability to make whatever you want. They design the bait in some CAD program and then make a mold. Master creation is like $350? and the production mold is about the same. One made they pour the heads for you and charge a piece rate based on hook, paint, eyes, etc. Keep in mind this is a single size mold. If you want 1/4, 3/8, and 1/2oz they will have to make 3 molds.
Your best cheap option is Bugmolds in Ukraine. They will make you a hand pour in like 3 different sizes for like $200. I have some of their molds and can say they work well. There downside is they get really hot, really fast compared to say a Do-It mold. This downside just means you can't sit down and pour 200 heads in an hour. I have a drop shot mold from them that after 5 pours its too hot to hold even with welding gloves.
JIG-HEAD MOLDS (bugmolds.com)
Allen