Depending on the hooks you prefer I can pour 100 jig heads for about $3 and that is at retail: hooks at $2 per 100 from captain hooks and lead at $1 a pound. For better quality hooks it can range from $10/100 to $65/100 or more. I fish steelhead and salmon mostly so my jigs cost more for heavier, stronger hooks. Most of the time I find lead for cheaper than that and if you look hard enough it can often be found for free. Wholesale prices drop the cost even further.
It really boils down to how many do you plan on making and how many do you need but Most important, how much do you really want to do it. I bought plastic molding stuff last year and I knew I would never sell them and I will likely never make enough that I would have saved any real money. The reason I did: I wanted to and I could not find any other way to get what I wanted, in the colors I wanted to make what I wanted the way I envisioned making them. For me there was no other reason.
I love taking my kids fishing, now if I could just manage to fish at the same time.