I been casting my own round balls and bullets for 3 years, in that time frame, I think i bought $50 worth of bullets. spent more on lead and molds then I have pre made bullets.
all your really need to get started is:
colman stove (or cheap knock off)
lead ladle (can use an steel spoon or ladle modded a little)
thrift store steel or iron pots (do not use aluminum)
lead (tire shops for hard stuff, check ebay for lead sheets, dr offices or roofers for soft back stop of ranges (free if public))
lee molds ($25 (high end) a pop for 2 cavity, single $18 or 19 each)
$75 to 100 to start up was my cost, considering 50 or 100 packs of round balls $14 and bullets cost $25 each local for me. I can make close to 40 .490 round balls with just little over a pound of lead.
sorry for the break down, everytime I start something new. I got to give and itemized list and how much it will save us to the boss