They can be bought at several places......BPS, Cabela's, etc. I buy my stuff from Barlowstackle.com.....they seem to have the best prices.

Try Google and you will get more suppliers.

Are the electric ones better than the cast iron over a burner?

Melting pot
 

Without a doubt for lead heads;crimp on ; worm weight's; egg weight's and etc. electric melting would be my choice.Pouring decoy strap's I use a latel with propane burner. I use a 10" sch80pipe about 7" deep with a 3/8"thick btm. Since the easiest way to get lead poison is from inalation ; proper half face respirator's may be advised.

What would be best to use to make the molds?