David
I started casting and am still using an old Coleman propane camping stove as a heat source, still using an old 1 qt cooking pot I got at a thrift store for a container, and bought a ladle and molds. For the pure lead roundballs I still use the original stuff. Oh, I also picked up an old muffin tin when I was at the thrift store for casting ingots.
I did go and get a cast iron pot when I started casting rifle bullets for my 40-70, and get a lot more iron oxide to clean off from the rusting from this than from the stainless cooking pot.
I'm making perfectly acceptable round balls and bullets on the back porch using this equipment. It's a lot cheaper than buying electric pots, and I'd rather ladle pour anyway. I can see what I'm doing.
I got about 350 lbs sheet lead from a local metals dealer, and that will last me a while. For round balls do not use wheel weights or buckshot, they both have tin and antimony and are way too hard. You want pure, or as close to pure lead as you can get. Several sources have been mentioned.
Lee roundball molds are fine, you don't have to get more expensive than this for roundballs. The alumunium molds are also somewhat less finicky to use. Remember, in cap and ball pistols you are swaging the ball to fit when you load, so the only thing you need to be careful of is to get a big enough ball mold.
It is addictive, just as any convenient money-saving process is. I started with rb's for my Cap and Ball pistols and am now casting for three rifles and a pistol as well!